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Precooling investigations with deciduous fruits - Allen, F. W. (Frank Wisdom), 1887 -1982 (Agricultural Experiment Station, 1935)

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Preservation of damp grain with propionic acid - Ulrich, Maria Danuta. (1974)

Principles of botany - Bergen, Joseph Y. (Joseph Young), 1851 -1917 (Ginn, 1906)

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Principles of plant physiology - Raber, Oran, 1893 -1940 (The Macmillan Co, 1938)

The principles of plant-teratology - Worsdell, Wilson Crosfield (The Ray Society, 1915)

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The Proceedings of the Iowa Academy of Science - Iowa Academy of Science (The Academy, 1918)

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The process of ripening in the tomato, considered especially from the commercial standpoint - Sando, Charles E. (Charles Earl), 1894 - (U.S. Dept. of Agriculture, 1920)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1898)

Prodrome de la flore Belge - De Wildeman, Emile 1866 -1947 (Alfred Castaigne, 1899)

Prodrome de la flore belge - Wildeman, E. de (Emile), 1866 -1947 (A. Castaigne, 1898)

The production of cigar-wrapper tobacco under shade in the Connecticut Vally - United States. Bureau of Plant Industry. (U.S. G.P.O, 1908)

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Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1911)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1914)

The protection of ornamental plants, 1979-April 1989 : citations from AGRICOLA concerning diseases and other environmental considerations - National Agricultural Library (U.S.) (U.S. Dept. of Agriculture, National Agricultural Library, 1989)

The protection of small fruits and berries, 1980-April 1989 : citations from AGRICOLA concerning diseases and other environmental considerations - National Agricultural Library (U.S.) (U.S. Dept. of Agriculture, National Agricultural Library, 1989)

The protection of stone fruits, excluding cherries, 1979-March 1985 : citations from Agricola concerning diseases and other environmental considerations - National Agricultural Library (U.S.) (U.S. Dept. of Agriculture, National Agricultural Library, 1985)

The protection of sugarcane and sugar beets, January 1979-February 1988 : citations from AGRICOLA concerning diseases and other environmental considerations - National Agricultural Library (U.S.) (U.S. Dept. of Agriculture, National Agricultural Library, 1988)

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[Publications on plant pathology from Cornell Agricultural Experiment Station Memoirs, collected by H.S. Jackson.] - Jackson, H. S. (Herbert Spencer), 1883 -1951 (Cornell University], 1915)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1854)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1874)

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Révision des champignons, tant supérieurs qu'inférieurs trouvés jusqu'à ce jour dans les Pays-Bas - Oudemans, C. A. J. A. (Cornelis Antoon Jan Abraham), 1825 -1906 (J. Mller, 1892)

Recent advances in microscopy; biological applications - MacBride, E. W. (Ernest William), 1866 -1940 (P. Blakiston's son & co., inc, 1931)

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The relation of the composition of the leaf to the burning qualities of tobacco - United States. Bureau of Plant Industry. (Govt. print. off, 1907)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1920)

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Report to the Lords Commissioners of His Majesty's Treasury of the Departmental Committee on Botanical Work and collections at the British Museum and at Kew, dated 11th March, 1901 - Great Britain. Committee on Botanical Work. (s.n, 1901)

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Reproduction des cryptogames - Rietsch, Maximilien. (G. Baillière, 1882)

Researches on fungi - Buller, A. H. Reginald (Arthur Henry Reginald), 1874 -1944 (Longmans, Green, 1958)

Resistance of the roots of some fruit species to low temperature - Carrick, D. B. (Doak Bain), 1888 -1962 (1920)