The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1906)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1910)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1909)

The Ohio naturalist - Ohio Academy of Science. (Biological Club of the Ohio State University, 1913)

Old Colony Nurseries Incorporated [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Old Colony Nurseries, 1914)

Old Plymouth trails - Packard, Winthrop, 1862 -1943 (Small, Maynard & company, 1920)

Old Plymouth trails - Packard, Winthrop, 1862 -1943 (Small, Maynard, 1920)

On the physical features of the central part of British North America and on its capabilities for settlement - Hector, James, Sir, 1834 -1907 (s.n.], 1861)

Opuscula philolichenum (J. Lendemer, 2004)

Opuscula philolichenum (J. Lendemer, 2006)

Opuscula philolichenum (J. Lendemer, 2009)

Opuscula philolichenum (J. Lendemer, 2011)

Opuscula philolichenum (J. Lendemer, 2015)

Opuscula philolichenum (J. Lendemer, 2017)

Opuscula philolichenum (J. Lendemer, 2018)

Opuscula philolichenum (J. Lendemer, 2020)

Orchard & garden book, 1944 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1944)

Orchard & garden book, 1945 - Roeding, George Christian, 1868 -1928 (California Nursery Company, 1945)

Orchard & garden book, 1946 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1946)

Orchard & garden book, 1947 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1947)

Orchard and garden book : 1865-1950, 85th year - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Seed Company, 1950)

Orchard and garden book, 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1936)

[Order forms] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Woodlot Seed Co, 1958)

The organic constituents of plants and vegetable substances and their chemical analysis - Wittstein, Georg Christian, 1810 -1887 (MCarron, Bird & Co, 1878)

Organographie der Pflanzen, insbesondere der Archegoniaten und Samenpflanzen - Goebel, K. (Karl), 1855 -1932 (G. Fischer, 1913)

Organography of plants, especially of the Archegoniata and Spermaphyta - Balfour, Isaac Bayley, 1853 -1922 (Clarendon press, 1900)

Organography of plants, especially of the archegoniatae and spermaphyta - Goebel, K. (Karl), 1855 -1932 (Clar. Press, 1900)

The original Barnes Brothers Nursery Co., established 1890 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Barnes Bros. Nursery Co, 1938)

Ornamental shrubs of the United States (hardy, cultivated) - Apgar, A. C. (Austin Craig), 1838 -1908 (American Book Company, 1910)

Ornamental shrubs of the United States, hardy, cultivated - Apgar, A. C. (Austin Craig), 1838 -1908 (American Book Co, 1910)

Ornamental trees and plants for home grounds and other landscape gardening, fruit trees for commercial orchards and home gardens : No. 127 price list, fall 1927-spring 1928 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (I.E. Ilgenfritz' Sons & Co, 1927)

Ornamental trees, evergreens and shrubs, roses, bulbs, fruit trees, lawn grasses - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Lakewood Nurseries, 1926)

Ornamental trees, evergreens, shrubs, perennials and rock garden plants : retail price list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Van's Nursery and Landscape Service, 1938)

Ornamental trees, shrubs, and woody climbers - Macoun, W. T. (William Tyrrell), 1869 -1933 (Canada Dept. of Agriculture, 1927)

Ornamental trees, shrubs, evergreens and conifers : descriptive catalog - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hogansville Nurseries, 1937)

Ornamental trees, shrubs, evergreens and conifers : descriptive catalog - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hogansville Nurseries, 1935)

Ornamentals [1931-32 season] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Glen Saint Mary Nurseries Co, 1931)

Ornithological biography, or an account of the habits of the birds of the United States of America ; accompanied by descriptions of the objects represented in the work entitled The Birds of America, and interspersed with delineations of American scenery and manners - Audubon, John James, 1785 -1851 (Adam Black, 1831)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1906)

The Ornithologist and oölogist (1887)

The ornithology of Illinois - Ridgway, Robert, 1850 -1929 (H.W. Rokker, printer, 1889)

The ornithology of Illinois - Ridgway, Robert, 1850 -1929 (H. W. Rokker, printer, 1889)

Österreichs Holzpflanzen = : Plantae lignosae Imperii Austriaci : eine auf genaue Berücksichtigung der merkmale der Laubblätter gegründete floristische Bearbeitung aller im Österreichischen Kaiserstaate wild wachsenden oder häufig cultivirten Bäume, Sträucher und Halbsträucher - Pokorny, Alois, 1826 -1886 (K.K. Hof- und Staatsdruckerei, 1864)

O.S.U. naturalist - Ohio State University. Biological Club. (Biological Club of Ohio State University, 1902)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1910)

Ouachita National Forest, Arkansas-Oklahoma - United States. Forest Service. Southern Region. (U.S. Govt. Print. Off, 1937)

Our 100th year, pioneer nurserymen since 1847 : Ilgenfritz, the Monroe Nursery - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (I.E. Ilgenfritz' Sons & Co, 1947)

Our garden journal [an illustrated quarterly conducted and controlled by amateur flower gardeners] - Harde, Elinore, E., Mrs., (1917)

Our latest catalog of fruits, berries, roses, shrubs, ornamental tree, evergreens, perennial flowers - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Benton County Nursery Co, 1939)

Our latest catalog of fruits, berries, roses, shrubs, ornamental trees, evergreens, perennial flowers - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Benton County Nursery Co, 1940)

Our latest reduced prices : special for this spring delivery from April 1, 1931, or later if wished - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Paul Offenberg Nursery Company, 1931)

Our native trees and how to identify them : a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1900)

Our native trees and how to identify them; a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1913)

Our native trees and how to identify them; a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1910)

Our native trees and how to identify them; a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1912)

Our native trees and how to identify them; a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1917)

Our native trees and how to identify them; a popular study of their habits and their peculiarities - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (Scribner, 1902)

Our trees. A popular account of the trees in the streets and gardens of Salem, and of the native trees of Essex County, Massachusetts, with the location of trees, and historical and botanical notes - Robinson, John, 1846 -1925 (Printed by N. A. Horton and Son, 1891)

Outdoor beauty for your home - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (C.M. Hobbs & Sons, 1928)

Outdoor beauty for your home [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Call's Nurseries, 1929)

Outdoor beauty for your home [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Call's Nurseries, 1930)

Outlines of classification and special morphology of plants - Balfour, Isaac Bayley, 1853 -1922 (Clarendon Press, 1887)

Outlines of classification and special morphology of plants - Goebel, K. (Karl), 1855 -1932 (Clarendon Press, 1887)

Overwash processes and foredune ecology, Nauset Spit, Massachusetts - Massachusetts Audubon Society. (U.S. Army Engineer Waterways Experiment Station, 1984)

Pages from a garden note-book - King, Francis, Mrs., 1863 -1948 (Scribner, 1921)

Die palaeobotanische Literatur : bibliographische Übersicht über die Arbeiten aus dem Gebiete der Palaeobotanik - Jongmans, W. (Willem), 1878 -1957 (Fischer, 1913)

Pamphlets on forest utilization (1900)

Pamphlets on forestry (1900)

Pamphlets on forestry. History (1900)

Pamphlets on forestry in Kansas (1900)

Pamphlets on forestry in Maryland (1900)

Pamphlets on forestry in Massachusetts (1900)

Pamphlets on forestry in Michigan (1900)

Pamphlets on forestry in Minnesota (1900)

Pamphlets on forestry in Nebraska (1900)

Pamphlets on forestry in North Carolina (1900)

Pamphlets on forestry in Ohio (1900)

Pamphlets on forestry in Pennsylvania (1900)

Pamphlets on forestry in Tennessee (1900)

Pamphlets on forestry in Texas (1900)

Pamphlets on silviculture (1899)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1925)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1962)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1976)