Flora of the District of Columbia and vicinity. By A.S. Hitchcock and Paul C. Standley, with the assistance of the botanists of Washington - Standley, Paul Carpenter, 1884 -1963 (Govt. print. off, 1919)

Flora of the Lesser Antilles : Leeward and Windward Islands - Garay, Leslie A. (Arnold Arboretum, Harvard University, 1989)

The flora of the North Appalachian Experimental Watershed and surrounding territory - Moldenke, Harold N. (Harold Norman), 1909 -1996 (Soil Conservation Service, U.S.D.A, 1943)

Flora of the northwest coast : including the area west of the summit of the Cascade Mountains, from the forty-ninth parallel south to the Calapooia Mountains on the south border of Lane County, Oregon - Piper, Charles V. (Charles Vancouver), 1867 -1926 (Press of the New era printing company, 1915)

Flora of the northwest coast, including the area west of the summit of the Cascade Mountains, from the forty-ninth parallel south to the Calapooia Mountains on the south border of Lane County, Oregon - Piper, Charles V. (Charles Vancouver), 1867 -1926 (Press of the New Era Printing Company, 1915)

The flora of the presidency of Bombay - Cooke, Theodore. (Taylor and Francis, 1903)

Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1917)

Flora of the Rocky Mountains and adjacent plains : Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, North Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (Rydberg, 1917)

Flora of the Rocky Mountains and adjacent plains, Colorado, Utah, Wyoming, Idaho, Montana, Saskatchewan, Alberta, and neighboring parts of Nebraska, South Dakota, North Dakota, and British Columbia - Rydberg, Per Axel, 1860 -1931 (The author, 1922)

Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana, and in Oklahoma and Texas east of the one hundredth meridian - Small, John Kunkel, 1869 -1938 (The author, 1913)

Flora of the southeastern United States; being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolin, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana and the Indian territory and in Oklahoma and Texas east of the one-hundredth meridian - Small, John Kunkel, 1869 -1938 (The author, 1903)

Flora of the southern United States: containing an abridged description of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arranged according to the natural system - Chapman, A. W. (Alvan Wentworth), 1809 -1899 (Cambridge Botanical Supply Co, 1897)

Flora of the southern United States: containing an abridged description of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arranged according to the natural system - Chapman, A. W. (Alvan Wentworth), 1809 -1899 (Ivison, Blakeman, 1889)

Flora of the southern United States: containing abridged descriptions of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arranged according to the natural system - Chapman, A. W. (Alvan Wentworth), 1809 -1899 (Ivison, Phinney, 1865)

Flora of the southern United States: containing an abridged description of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arr. according to the natural system - Chapman, A. W. (Alvan Wentworth), 1809 -1899 (American Book Co, 1897)

Flora of the Southern United States: containing an abridged description of the flowering plants and ferns of Tennessee, North and South Carolina, Georgia, Alabama, Mississippi, and Florida: arranged according to the natural system - Chapman, A. W. (Alvan Wentworth), 1809 -1899 (Ivison, Blakeman, Taylor & Co, 1883)

Flora of the upper Gangetic plain, and of the adjacent Siwalik and sub-Himalayan tracts - Parker, R. N. (Superintendent of Government Printing, 1903)

The flora of the upper Susquehanna and its tributaries - Clute, Willard Nelson, 1869 -1950 (W.N. Clute, 1898)

Flora of the U.S.S.R - Botanicheskiĭ institut (Akademii︠a︡ nauk SSSR) (Israel Program for Scientific Translations, 1999)

Flora of the vicinity of New York; a contribution to plant geography - Taylor, Norman, 1883 -1967 (1915)

Flora of Vermont. List of ferns and seed plants growing without cultivation - Kirk, George Leavitt, 1878 -1966 (Free Press Print. Co, 1915)

Flora of Vermont; a list of the fern and seed plants growing without cultivation - Vermont Botanical Club. (Free Press Association, 1900)

Flora, or, Vegetable life of the mountain - Jackson, Robert Montgomery Smith, 1815 -1865 (Lippincott, 1860)

Flora padovana; ossia, Prospetto floristico e fitogeografico delle piante vascolari indigene inselvatichite o largamente coltivate crescenti nella provincia di Padova; con notizie storico-bibliografiche sulle fonti della flora ed illustrata da 20 tavole - Béguinot, Augusto, 1875 -1940 (Prem. Soc. coop. tip, 1909)

Flora pharmaceutica e alimentar portugueza; ou, Tractado daquelles vegetaes indigenas de Portugal, e outros nelle cultivados, cujos productos são usados, ou susceptiveis de se usar come remedios e alimentos ... - Figueiredo, Jeronymo Joaquim de. (Na typographia da Academia R. das Sciencias, 1825)

Flora Polonica phanerogama, sive, Descriptiones plantarum phanerogamicarum in Regno Poloniae tam sponte nascentium quam continuata cultura solo nostro assuefactarum Linnaeana methodo dispositae praemisso conspectu generali familiarum regni vegetabilis naturalium - Waga, Jacob. (Typ. Stanislai Straeski, 1847)

Flora Sardoa; seu Historia plantarum in Sardinia et adjacentibus insulis vel sponte nascentium vel ad utilitatem latius excultarum - Moris, Giuseppe Giacinto, 1796 -1869 (Ex Regio Typographeo, 1837)

Flora Saxonica. Die Flora von Sachsen, ein botanisches Excursionsbuch ... Nebst Schlu¨ssel zum erleichterten Bestimmen der Gattungen nach Linnee's Sexualsystem - Reichenbach, H. G. Ludwig (Heinrich Gottlieb Ludwig), 1793 -1879 (In der Arnoldischen Buchh, 1844)

Flora Vitiensis nova : a new Flora of Fiji (spermatophytes only) - Smith, Albert C. (Albert Charles), 1906 Apr 5 - (Pacific Tropical Botanical Garden, 1991)

Flora von Brandenburg und Umgegend : mit Berücksichtigung der Nachbarstädte Belzig, Genthin, Nauen, Rathenow und Werder - Schramm. (J. Wiesike, 1857)

Flora von Erfurt. Verzeichnis der im Kreise Erfurt und seiner nächsten Umgebung beobachteten Gafässpflanzen - Reinecke, Karl L. (C. Villaret, 1914)

Flora von Meklenburg, in geographischer, geschichtlicher, systematischer, statistischer u.s.w. Hinsicht - Boll, Ernst, 1817 -1868 (C. Brünslow, 1860)

Flora von Nieder-Österreich - Beck-Mannagetta, G. (Günther), 1856 -1931 (C. Gerold, 1890)

Flora von Nord- und Mittel-Deutschland. Zum Gebrauche auf Excursionen in Schulen und beim Selbstunterricht, bearb. von August Garcke - Garcke, Aug. (August), 1819 -1904 (Wiegandt und Hempel, 1873)

Flora von Schlesien, preussischen und österreichischen Anteils - Schube, Theodor, 1860 -1934 (Korn, 1904)

Flora von Schlesien, preussischen und österreichischen Antheils, oder, Vom oberen Oder- und Weichsel-Quellen-Gebiet. Nach natürlichen Familien, mit Hinweisung auf das Linnéische System - Wimmer, Friedrich, 1803 -1868 (F. Hirt, 1857)

Flora von Tirol. Ein Verzeichniss der in Tirol und Vorarlberg wild wachsenden und häesiger gebauten Gefässpflanzen. Mit Berücksichtigung ihrer Verbreitung und örtlichen Verhältnisse verfasst und nach Koch's Synopsis der deutschen Flora geordnet - Hausmann, Franz von, Baron, 1810 -1878 (Wagner, 1851)

Flora Wirceburgensis, sive, Plantarum in Magno-Ducatu Wirceburgensi indigenarum enumeratio systematica - Heller, Franz Xaver, 1778 -1840 (J. Stahel, 1810)

The floral kingdom : its history, sentiment and poetry : A dictionary of more than three hundred plants, with the genera and families to which they belong, and the language of each illustrated with appropriate gems to poetry - Turner, Cordelia Harris. (M. Warren, 1877)

Floras (1865)

La flore adventice de Montpellier - Thellung, Albert, 1881 -1928 (E. Le Maout, 1912)

Flore analytique & descriptive des provinces de Namur et de Luxembourg (plantes indigènes et cultivées) accompagnée d'une carte botanique, des étymologies des noms, des propriétés des plantes, etc - Pâque, Égide, 1850 -1918 (Ad. Wesmael-Charlier, 1902)

Flore analytique de Toulouse et de ses environs - Noulet, Jean Baptiste, 1802 -1890 (Librairie centrale, 1855)

Flore analytique du Berry : contentant toutes les plantes vasculaires spontanées ou cultivées en grand dans les départements de l'Indre & du Cher - Le Grand, Antoine, 19th cent - (Soumard-Berneau, 1887)

Flore de la Côte-d'Or : avec déterminations par les parties souterraines - Royer, Charles, 1831? -1883 (F. Savy, 1881)

Flore des Alpes maritimes; ou, Catalogue raisonné des plantes qui croissent spontanément dans la chaine des Alpes maritimes - Briquet, John, 1870 -1931 (H. Georg, 1892)

Flore des Alpes Maritimes; ou, Catalogue raisonné des plantes qui croissent spontanément dans la chaine des Alpes Maritimes y compris le département francais de ce nom et une partie de la Ligurie occidentale - Briquet, John, 1870 -1931 (H. Georg, 1892)

Flore des Basses-Pyrénées - Bergeret, Eugène, 1799 -1868 (Imprimerie-stéréotype Garet, 1909)

Flore des jardins et des grandes cultures, ou Description des plantes de jardins, d'orangeries et des grandes cultures, leur multiplication, l'epoque de leur fleuraison et de leur fructification, et leur emploi, avec planches gravées, dont une coloriée - Seringe, N. C. (Nicolas Charles), 1776 -1858 (C. Savy, jeune, 1849)

Flore du grand-duché de Luxembourg. Plantes phanérogames - Krombach, J.-H.-W. (Johann-Heinrich-Wilhelm), 1791 -1881 (Joris, 1875)

Flore du nord de la France : ou description des plantes indigènes et de celles cultivées dans les départmens de la Lys, de l'Escout, de la Dyle et des Deux-Nèthes, y compris les plantes qui naissent dans les pays limitrophes de ces Départemens ... / par F. Roucel - Roucel, Mr. (François-Antoine) (Me. Vve. Richard, 1803)

Flore du Parc national du mont Riding, Manitoba - Service canadien des parcs. (Direction générale de la recherche, Agriculture Canada, 1988)

La flore et la pomone francaises :histoire et figure en couleur, des fleurs et des fruits de France ou naturalises sur le sol francais - Jaume Saint-Hilaire, Jean Henri, 1772 -1845 (Chez l'auteur, rue Furstemberg, 1828)

Flore française, ou, Descriptions succinctes de toutes les plantes qui croissent naturellement en France : disposées selon une nouvelle méthode d'analyse, et précédées par un exposé des principes élémentaires de la botanique - Candolle, Augustin Pyramus de, 1778 -1841 (Chez Desray, 1815)

Flore médicale des Antilles, ou, Traité des plantes usuelles :des colonies Françaises, Anglaises, Espagnoles et Portugaises - Descourtilz, J. T. (Jean Théodore) 1796 -1855 (Pichard, 1829)

Flore phanérogamique des Antilles françaises (Guadeloupe et Martinique) - Duss, R.-P. (Antoine), 1840 -1924 (Protat, 1897)

Flore pittoresque et me´dicale des Antilles, ou, Histoire naturelle des plantes usuelles des colonies franc¸aises, anglaises, espagnoles et portugaises - Descourtilz, M. E. (Michel Etienne), 1775 -1835 (Pichard, 1829)

Flore populaire, ou, Histoire naturelle des plantes dans leurs rapports avec la linguistique et le folklore ... - Gaidoz, Henri, 1842 -1932 (Librairie Rolland [etc.], 1908)

Florist's manual (1833)

The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general ([A.T. De la Mare Ptg. and Pub. Co, 1906)

The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general ([A.T. De la Mare Ptg. and Pub. Co, 1888)

The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general ([A.T. De la Mare Ptg. and Pub. Co, 1907)

The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general ([A.T. De la Mare Ptg. and Pub. Co, 1909)

Flower ecology - Pammel, L. H. (Louis Hermann), 1862 -1931 (Press of J. B. Hungerford, 1898)

Flower gardening - Adams, H. S. (Henry Sherman), 1864 - (1913)

Flower gardening - Adams, H. S. (Henry Sherman), 1864 - (McBride, Nast & Company, 1913)

Flower guide : wild flowers east of the Rockies - Reed, Chester A. (Chester Albert), 1876 -1912 (Doubleday, Page & Co, 1919)

The flowering plant: as illustrating the first principles of botany - Ainsworth-Davis, J. R. (James Richard), 1861 -1934 (Griffin, 1900)

The flowering plant: as illustrating the first principles of botany. Especially adapted for London matriculation, South Kensington, and university local examinations in elementary botany - Ainsworth-Davis, J. R. (James Richard), 1861 -1934 (Griffin, 1890)

The flowering plant: as illustrating the first principles of botany - Ainsworth-Davis, J. R. (James Richard), 1861 -1934 (Griffin, 1892)

Flowering plants and ferns of Arizona - Kearney, Thomas H. (Thomas Henry), 1874 -1956 (U.S. Dept. of Agriculture, 1942)

The flowering plants of Western India - Nairne, Alexander Kyd. (W. H. Allen, 1894)

The flowering process - Salisbury, Frank B. (Macmillan, 1963)

Flowers and ferns in their haunts - Wright, Mabel Osgood, 1859 -1934 (The Macmillan company, 1901)

Flowers and insects : contributions to an account of the ecological relations of the entomophilous flora and the anthophilous insect fauna of the neighborhood of Carlinville, Illinois, 1889-1896 - Robertson, Charles, 1858 - (1896)

Flowers and insects; lists of visitors of four hundred and fifty-three flowers - Robertson, Charles, 1858 -1935 (n.p, 1928)

Flowers and vegetables : "the unusual and the universal" : spring, 1938 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1938)

Flowers and vegetables : "the unusual and the universal" : spring, 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1934)

Flowers and vegetables : "the unusual and the universal" : spring, 1939 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Incorporated, 1939)

Flowers and vegetables : "the unusual and the universal" : spring, 1940 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Incorporated, 1940)

Flowers and vegetables : "the unusual and the universal" : spring, 1941 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Frank G. Sealey Co., Inc, 1941)

Flowers and vegetables : "the unusual and the universal" : spring, 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1937)

Flowers and vegetables : "the unusual and the universal" : spring, 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1935)

Flowers and vegetables : "the unusual and the universal" : spring, 1936 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1936)

Flowers and vegetables : "the unusual and the universal" : spring 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Muller-Sealey Co., Inc, 1932)

Food and agriculture competitively awarded research grants - United States. Cooperative State Research Service. (U.S. Dept. of Agriculture, 1981)

The forage and fiber crops in America - Hunt, Thomas F. (Thomas Forsyth), 1862 -1927 (Orange Judd company; [etc., etc.], 1907)

Forage crops other than grasses - Shaw, Thomas, 1843 -1918 (Orange Judd company, 1900)

Forage crops other than grasses : how to cultivate, harvest and use them - Shaw, Thomas, 1843 -1918 (Orange Judd company, 1900)

Forage plants and their culture - Piper, Charles V. (Charles Vancouver), 1867 -1926 (The Macmillan company, 1914)

Forest and stream ([Forest and Stream Publishing Co.], 1877)

Forest and stream ([Forest and Stream Publishing Co.], 1895)

Forest culture and eucalyptus trees - Cooper, Ellwood, 1829 -1918 (Cubery, 1876)

Forest culture and eucalyptus trees - Cooper, Ellwood, 1829 -1918 (Cubery & Company, 1876)

The forester : a practical treatise on British forestry and arboriculture for landowners, land agents, and foresters - Nisbet, John, 1853 -1914 (W. Blackwood and Sons, 1905)

The forests and gardens of South India - Cleghorn, H. (Hugh Francis Clarke), 1820 -1895 (W. H. Allen, 1861)

Forstliche Botanik - Schwarz, Frank, 1857 -1928 (P. Parey, 1892)

Die Fortschritte der Botanik (Mayer, 1879)

Fortschritte der naturwissenschaftlichen Forschung. Hrsg. von E. Abderhalden - Abderhalden, Emil, 1877 -1950 (Urban & Schwarzenberg, 1910)

Fortsetzung des Allgemeinen teutschen Garten-Magazins : oder gemeinnützige Beiträge für alle Theile des praktischen Gartenwesens - Industrie-Comptoir (Weimar, Thuringia, Germany), (Im Verlage des Landes-Industrie-Comptoirs, 1818)

Fortsetzung des Allgemeinen teutschen Garten-Magazins : oder gemeinnützige Beiträge für alle Theile des praktischen Gartenwesens - Industrie-Comptoir (Weimar, Thuringia, Germany), (Im Verlage des Landes-Industrie-Comptoirs, 1820)

Fortsetzung des Allgemeinen teutschen Garten-Magazins : oder gemeinnützige Beiträge für alle Theile des praktischen Gartenwesens - Industrie-Comptoir (Weimar, Thuringia, Germany), (Im Verlage des Landes-Industrie-Comptoirs, 1822)

Fortsetzung des Allgemeinen teutschen Garten-Magazins : oder gemeinnützige Beiträge für alle Theile des praktischen Gartenwesens - Industrie-Comptoir (Weimar, Thuringia, Germany), (Im Verlage des Landes-Industrie-Comptoirs, 1824)

Foundations of botany - Bergen, Joseph Y. (Joseph Young), 1851 -1917 (Ginn & Co, 1901)

Foundations of botany - Bergen, Joseph Y. (Joseph Young), 1851 -1917 (Ginn & co, 1904)

Foundations of botany - Bergen, Joseph Y. (Joseph Young), 1851 -1917 (Ginn, 1901)

Die fremdländischen Stubenvögel ; ihre Naturgeschichte, Pflege, und Zucht - Russ, Karl, 1833 -1899 (Carl Rümpler, 1888)

Froriep's Notizen aus dem Gebiete der Natur- und Heilkunde - Froriep, Robert, 1804 -1861 (F. Mauke, 1859)

Fruit and ornamental trees evergreens, palms, shrubs, roses etc Price catalog 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (California Nursery Company, 1919)

The fruit, flower, and kitchen garden - Neill, Patrick, 1776 -1851 (H. C. Baird, 1851)

Der Führer in die Pflanzenwelt. Hülfsbuch zur Auffindung und Bestimmung der wichtigsten in Deutschland wild wachsenden Pflanzen - Postel, Emil. (Schulbuchhandlung von F.G.L. Gressler, 1866)

Fundamental aspects of normal and malignant growth - Nowinski, Wiktor W. (Elsevier Pub. Co, 1960)

Fungous diseases of plants - Duggar, Benjamin M. (Benjamin Minge), 1872 -1956 (Ginn and company, 1909)

Fungous diseases of plants, with chapters on physiology, culture methods and technique - Duggar, Benjamin M. (Benjamin Minge), 1872 -1956 (Ginn, 1909)

Fungous diseases of plants; with chapters on physiology, culture methods and techniques - Duggar, Benjamin M. (Benjamin Minge), 1872 -1956 (Ginn, 1909)

Fungous diseases of plants, with chapters on physiology, culture methods and technique - Duggar, Benjamin M. (Benjamin Minge), 1872 -1956 (Ginn and company, 1909)

The Gaelic names of plants (Scottish, Irish and Manx) - Cameron, John, of Sunderland. (J. Mackay, 1900)

The Gaelic names of plants (Scottish, Irish, and Manx), collected and arranged in scientific order, with notes on their etymology, uses, plant superstitions, etc., among the Celts, with copious Gaelic, English, and scientific indices - Cameron, John, of Sunderland. (J. Mackay, 1900)

The Garden: an illustrated weekly journal of gardening in all its branches (1871)

The Garden: an illustrated weekly journal of gardening in all its branches (1875)

The Garden: an illustrated weekly journal of gardening in all its branches (1876)

The Garden: an illustrated weekly journal of gardening in all its branches (1877)

The Garden: an illustrated weekly journal of gardening in all its branches (1883)

The Garden: an illustrated weekly journal of gardening in all its branches (1884)

The Garden: an illustrated weekly journal of gardening in all its branches (1885)

The Garden: an illustrated weekly journal of gardening in all its branches (1889)

The Garden: an illustrated weekly journal of gardening in all its branches (1890)

The Garden: an illustrated weekly journal of gardening in all its branches (1891)

The Garden: an illustrated weekly journal of gardening in all its branches (1892)

The Garden: an illustrated weekly journal of gardening in all its branches (1903)

The Garden: an illustrated weekly journal of gardening in all its branches (1916)

The Garden: an illustrated weekly journal of gardening in all its branches (1917)

The Garden: an illustrated weekly journal of gardening in all its branches (1918)

The garden and farm : the best seeds to use when and hot to plant all accessories for producing the best crops - Schling, Max, Inc. (Max Schling, Inc, 1918)

The garden and farm : the best seeds to use when and hot to plant all accessories for producing the best crops - Schling, Max, Inc. (Max Schling, Inc, 1919)

The garden and farm : the best seeds to use when and hot to plant all accessories for producing the best crops - Schling, Max, Inc. (Max Schling, Inc, 1920)

The garden and farm : the best seeds to use when and hot to plant all accessories for producing the best crops - Schling, Max, Inc. (Max Schling, Inc, 1921)

The garden and farm : the best seeds to use when and how to plant all accessories for producing the best crops - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Max Schling, Inc, 1920)

Garden and forest; a journal of horticulture, landscape art and forestry - Sargent, Charles Sprague, 1841 -1927 (The Garden and forest publishing co, 1894)

Garden annual 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hovey & Co, 1934)

Garden annual : high quality seeds, bulbs, plants, complete garden supplies : 1949 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Stumpp & Walter Co, 1949)

Garden farming - Corbett, L. C. (Lee Cleveland), 1867 -1940 (Ginn and company, 1913)

Garden flea-hopper in alfalfa and its control - Beyer, A. H. (Adolph Harvey), 1882 - (U.S. Dept. of Agriculture, 1921)