What, where, when and how to plant : concise directions for the planting and care of fruit and ornamental trees, plants, roses, shrubs, evergreens, vines and perennials : facts on four questions that everyone wants to know - Hottes, Alfred Carl, 1891 -1955 (Call's Nurseries, 1926)

Whitefly of the world : a systematic catalogue of the Aleyrodidae (Homoptera) with host plant and natural enemy data - British Museum (Natural History) (British Museum (Natural History) and Wiley, 1978)

Who's who among the wild flowers - Beecroft, W. I. (Willey Ingraham), 1870 - (Moffat, Yard and company, 1910)

Who's who among the wild flowers - Beecroft, W. I. (Willey Ingraham), 1870 - (Moffat, Yard, 1910)

Wholesale American seeds of conifers, palms, trees, shrubs and herbaceous plants : perennials for fall planting - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pinehurst Nurseries, 1899)

Wholesale bulletin No. 1 March 18, 1943 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Mount Arbor Nurseries, 1943)

Wholesale bulletin No. 2 April 10, 1943 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Mount Arbor Nurseries, 1943)

Wholesale catalogue of ground cover plants, pachysandra, English ivy, Halls honeysuckle, euonymus, Vinca Minor, wild thyme, etc - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hugh B. Barclay, 1931)

Wholesale catalogue of R.B. Parsons & Co. for fall of 1874 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. ([Kissena Nurseries], 1874)

Wholesale catalogue of vegetable and flower seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R. & J. Farquhar, 1916)

Wholesale catalogue of vegetable and flower seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R. & J. Farquhar, 1917)

Wholesale Holland plant list, 1947-48 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Guldemond's, 1947)

Wholesale list of the F. & F. Nurseries : fall 1916-spring 1917 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F. & F. Nurseries, 1916)

The wholesale nurseries of Jackson & Perkins Company : trade price list fall 1913 spring 1914 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jackson & Perkins Company, 1913)

Wholesale price-list - Alma Nurseries. (Alma Nurseries, 1914)

Wholesale price-list - Alma Nurseries. (Alma Nurseries, 1915)

Wholesale price list, 1933 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Profile Collecting Company, 1933)

Wholesale price list, 1943 : garden for victory - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1943)

Wholesale price list. evergreens, hardy shrubs, forest and shade trees, tree seedlings, vines, seeds, hardwood cuttings, hedge plants No. 3, spring 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Forest Nursery Co. Incorporated, 1937)

Wholesale price list. evergreens, hardy shrubs, forest and shade trees, tree seedlings, vines, seeds, hardwood cuttings, hedge plants No. 2 fall 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Forest Nursery Co. Incorporated, 1935)

Wholesale price list. evergreens, hardy shrubs, forest and shade trees, tree seedlings, vines, seeds, hardwood cuttings, hedge plants No. 1 fall 1936 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Forest Nursery Co. Incorporated, 1936)

Wholesale price list, fall 1917 : for nurserymen, landscape gardeners, dealers and florists only - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Naperville Nurseries, 1917)

Wholesale price list : fall 1926 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1926)

Wholesale price list : fall 1926 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry Kohankie & Son, 1926)

Wholesale price list : fall 1927 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry Kohankie & Son, 1927)

Wholesale price list : fall 1927 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1927)

Wholesale price list : fall 1928 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1928)

Wholesale price list : fall, 1931 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1931)

Wholesale price list : fall, 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1932)

Wholesale price list, fall 1932 spring 1933 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Profile Collecting Company, 1932)

Wholesale price list, fall 1936 - spring 1937 : trees, shrubs, vines, evergreens, bulbs, fruit trees, lining out stock - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Boyd Nursery Co, 1936)

Wholesale price list, fall 1944 – spring 1945 : garden for victory - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1944)

Wholesale price list, fall 1946 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1946)

Wholesale price list : fall 1952 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1952)

Wholesale price list : fall 1953 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1953)

Wholesale price list : fall 1954 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1954)

Wholesale price list : fall 1955 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1955)

Wholesale price list : fall, 1955 - spring, 1956 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Horton Nurseries, Inc, 1955)

Wholesale price list : fall, 1956 - spring, 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Horton Nurseries, Inc, 1956)

Wholesale price list : fall 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1957)

Wholesale price list : fall, 1957 - spring, 1958 : shrubs, trees, herbaceous perennials, roses, evergreens - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Horton Nurseries, Inc, 1957)

Wholesale price list : fall, 1958 - spring, 1959 : shrubs, trees, herbaceous perennials, roses, evergreens - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Horton Nurseries, Inc, 1958)

Wholesale price list : fall 1959, spring 1960 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1959)

Wholesale price list for nurserymen, landscape gardeners, dealers and florists only : spring 1918 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Naperville Nurseries, 1918)

Wholesale price list for nurserymen, landscape gardeners, dealers and florists only Spring 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Naperville Nurseries, 1919)

Wholesale price-list : Kelsey's rhododendrons, azaleas and other strictly hardy American plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Harlan P. Kelsey, 1909)

Wholesale price list of collected native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1940)

Wholesale price list of collected native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1938)

Wholesale price list of collected native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1939)

Wholesale price list of collected native wild flowers, ferns, trees, shrubs, vines and native plant seed - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jos. R. Mumbauer & Son, 1920)

Wholesale price list of hardy native flowering shrubs, perennials and broadleaf evergreens, ferns, bulbs, bog and aquatic plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A.J. Greene, 1940)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1944)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1950)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1943)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1946)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1947)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1948)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1945)

Wholesale price list of native trees, shrubs, plants and bulbs, 1941 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1941)

Wholesale price list of native trees, shrubs, plants and bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.E. Williams Nursery Company, 1942)

Wholesale price list of nursery stock Season 1918-1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jackson & Perkins, 1918)

Wholesale price list, season 1935, 1936 season : trees, shrubs, evergreens, bulbs, vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Boyd Nursery Co, 1935)

Wholesale price list : season for fall 1954 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1954)

Wholesale price list : season for fall 1955 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1955)

Wholesale price list : season for fall 1956 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1956)

Wholesale price list : season for fall 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1957)

Wholesale price list : season for fall 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1958)

Wholesale price list : season for spring 1954 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1954)

Wholesale price list : season for spring 1955 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1955)

Wholesale price list : season for spring 1956 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1956)

Wholesale price list : season for spring 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1957)

Wholesale price list : season for spring 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles Fiore Nurseries, Incorporated, 1958)

Wholesale price list, spring 1917 : for nurserymen, landscape gardeners, dealers and florists only - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Naperville Nurseries, 1917)

Wholesale price list : spring 1926 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1926)

Wholesale price list : spring 1926 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry Kohankie & Son, 1926)

Wholesale price list : spring 1927 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1927)

Wholesale price list : spring 1927 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry Kohankie & Son, 1927)

Wholesale price list : spring 1929 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1929)

Wholesale price list : spring, 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1932)

Wholesale price list : spring, 1933 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1933)

Wholesale price list : spring 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Donaldson Nurseries, 1937)

Wholesale price list : spring 1942 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1942)

Wholesale price list : spring 1945 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Charles G. Curtis Co, 1945)

Wholesale price list, spring 1946 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1946)

Wholesale price list : spring 1953 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1953)

Wholesale price list : spring 1954 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1954)

Wholesale price list : spring 1957 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1957)

Wholesale price list : spring 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Princeton Nurseries, 1958)

Wholesale trade list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Otto Katzenstein, 1904)

Wholesale trade list - Bay State Nurseries. (The Nurseries, 1919)

Wholesale trade list Spring 1949 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Mount Arbor Nurseries, 1949)

Wholesale trade list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1912)

Wholesale trade-list : 1912 - Biltmore Nursery (Biltmore, N.C.) (Biltmore Nursery, 1912)

Wholesale trade-list : 1914 - Biltmore Nursery (Biltmore, N.C.) (Biltmore Nursery, 1914)

Wholesale trade list : Eastern Nurseries fall, 1910-spring, 1911 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1910)

Wholesale trade list : Eastern Nurseries spring, 1912 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1912)

Wholesale trade list : fall, 1915-spring, 1916 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1915)

Wholesale trade list : fall and spring 1924-1925 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Gardens of the Blue Ridge, 1924)

Wholesale trade list No. 385, spring 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Naperville Nurseries, 1937)

Wholesale trade list of collected native trees, shrubs and plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perkiomen Gardens, 1926)

Wholesale trade list of hardy native plants : spring & fall 1936 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A.J. Greene, 1936)

Wholesale trade list of hardy native plants : spring - fall 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A.J. Greene, 1935)

Wholesale trade list of hardy native wild plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (A.J. Greene, 1937)

Wholesale trade-list of Pinehurst Nurseries : woody and herbaceous plants and other ornamentals - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pinehurst Nurseries, 1902)

Wholesale trade list of the F. & F. Nurseries Fall 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F. & F. Nurseries, 1919)

Wholesale trade list of the F. & F. Nurseries Spring 1920 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F. & F. Nurseries, 1920)

Wholesale trade list of the F. & F. Nurseries and Princeton Nurseries, Wm. Flemer's Sons, props. for nurserymen and dealers : Spring 1922 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F. & F. Nurseries, 1922)

Wholesale trade-list : season of 1907-1908 - Biltmore Nursery (Biltmore, N.C.) (Biltmore Nursery, 1908)

Wholesale trade-list : season of 1909-1910 - Biltmore Nursery (Biltmore, N.C.) (Biltmore Nursery, 1909)

Wholesale trade list : spring, 1914-fall, 1914 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1914)

Wholesale trade list : spring, 1915 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Henry S. Dawson, 1915)

Wholesale trade price list - Framingham Nurseries. (Framingham Nurseries, 1917)

Wholesale trade price list - Framingham Nurseries. (Framingham Nurseries, 1918)

Wiener illustrirte garten-zeitung

Wiener illustrirte Garten-Zeitung - Kaiserlich-Königliche Gartenbau-Gesellschaft in Wien. (W. Frick, 1887)

Wiener illustrirte Garten-Zeitung - Kaiserlich-Königliche Gartenbau-Gesellschaft in Wien. (W. Frick, 1889)

Wiener illustrirte Garten-Zeitung - Kaiserlich-Königliche Gartenbau-Gesellschaft in Wien. (W. Frick, 1896)

Wiener illustrirte Garten-Zeitung - Kaiserlich-Königliche Gartenbau-Gesellschaft in Wien. (W. Frick, 1899)

Wild flower seeds for sale : an aid to conservation of native flora - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Alice Earle Hyde, 1942)

Wild flowers every child should know - Stack, Frederic William, 1871 - (Grosset & Dunlap, 1909)

Wild flowers every child should know : arranged according to color, with reliable descriptions of the more common species of the United States and Canada - Stack, Frederic William, 1871 - (Grosset & Dunlap, 1909)

Wild flowers every child should know, arranged according to color, with reliable descriptions of the more common species of the United States and Canada - Stack, Frederic William, 1871 - (Doubleday, Page and Co, 1909)

Wild flowers every child should know : arranged according to color with reliable descriptions of the more common species of the United States and Canada - Stack, Frederic William, 1871 - (Doubleday, Page and Company, 1909)

Wild flowers of New York - House, Homer D. (Homer Doliver), 1878 -1949 (University of the State of New York, 1918)

Wild flowers of New York - House, Homer D. (Homer Doliver), 1878 -1949 (The University of the state of New York, 1918)

Wild flowers worth knowing - Doubleday, Nellie Blanchan DeGraff, 1865 -1918 (IndyPublish.com, 1917)

Wild medicinal plants of the United States - United States. Bureau of Plant Industry. (G.P.O, 1906)

Wild native flowering plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1958)

Wild native flowering plants of Western North Carolina : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1948)

Wild native flowering plants of Western North Carolina : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1949)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1952)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1956)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1957)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1953)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1955)

Wild native flowering plants : ornamental shrubs and trees, evergreens, perennials, ferns and vines - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Three Laurels, 1951)

Wildland shrubs– their biology and utilization - Intermountain Forest; Range Experiment Station (Ogden, Utah) (Intermountain Forest and Range Experiment Station, U.S. Dept. of Agriculture, 1972)

Wildlife and fisheries habitat improvement handbook - United States. Forest Service. Wildlife; Fisheries Staff. (U.S. Dept. of Agriculture, Forest Service, Wildlife and Fisheries, 1990)

The Wilson bulletin - Agassiz Association. Wilson Ornithological Chapter. (Wilson Ornithological Society, 1911)

Winter botany - Trelease, William, 1857 -1945 (The author, 1918)

Winter botany, a companion volume to the author's Plant materials of decorative gardening - Trelease, William, 1857 -1945 (The author, 1918)

Winter botany, a companion volume to the author's Plant materials of decorative gardening - Trelease, William, 1857 -1945 (Trelease, 1918)

Winterson's garden guide : season 1916 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Winterson's Seed Store, 1916)

Wm. Flemer's Sons Inc., F. & F. Nurseries-Princeton Nurseries - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Wm. Flemer's Sons Inc, 1928)

Woody plants in winter; a manual of common trees and shrubs in winter in the Northeastern United States and southeastern Canada - Ammons, Nelle P. 1889 - (Boxwood Press, 1958)

The woody plants of Kentucky - Garman, Harrison, 1858 - (Kentucky Agricultural Experiment Station of the State University, 1913)

Wörterbücher der Naturgeschichte : in der deutschen, holländischen, dänischen, schwedischen, englischen, französischen, italienischen, Spanischen und Portugisischen Sprache - Nemnich, Philipp Andreas, 1764 -1822 (Adam Friedrich Böhme, 1798)

[Wyman's Framingham Nurseries materials] - Liberty Hyde Bailey Hortorium. Ethel Z. Bailey Horticultural Catalogue Collection. (1918)

Year book [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Plainfield Nursery, 1926)

Year book [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Plainfield Nursery, 1927)

Year book of the Pennsylvania Horticultural Society - Pennsylvania Horticultural Society. (Pennsylvania Horticulutural Society, 1936)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1909)

Yearbook of agriculture - United States. Department of Agriculture. (U.S. Govt. Print. Off, 1910)

Zeitschrift fur Acclimatisation - Acclimatisations Verein.

Zeitschrift für Botanik (1911)

Zeitschrift für Botanik (1912)

Zeitschrift für Botanik (1921)

Zeitschrift für die gesammten Naturwissenschaft - Naturwissenschaftlicher Verein für Sachsen und Thüringen in Halle. (Wiegandt, Hempel & Parey, 1860)

Zeitschrift für Naturwissenschaften - Naturwissenschaftlicher Verein für Sachsen und Thüringen in Halle. (Verlag Naturwissenschaftlichen Vereins für Sachsen und Thüringen, 1882)

Zeitschrift für Pflanzenkrankheiten (E. Ulmer, 1891)