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

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

Outlines of plant life : with special reference to form and function - Barnes, Charles Reid, 1858 -1910 (Henry Holt and Company, 1900)

Outlines of the history of botany - Harvey-Gibson, R. J. (Robert John), 1860 -1929 (Black, 1919)

Outlines of the history of botany - Harvey-Gibson, R. J. (Robert John), 1860 -1929 (A.& C. Black, 1919)

Oxford gardens, based upon Daubeny's Popular guide to the physick garden of Oxford: with notes on the gardens of the colleges and on the University park - Gunther, R. T. (Robert Theodore), 1869 -1940 (Parker & son; [etc., etc.], 1912)

Pacific science - University of Hawaii. (University Press of Hawaii, 1947)

Pacific science - University of Hawaii. (University Press of Hawaii, 1961)

Pacific science - University of Hawaii. (University Press of Hawaii, 1967)

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

Palaeontology - Palaeontological Association (Palaeontological Association, 1963)

Palaeontology - Palaeontological Association (Palaeontological Association, 1975)

Palaeontology - Palaeontological Association (Palaeontological Association, 1978)

Palladin's Plant physiology - Hopping, Aleita, 1890 - (P. Blakiston's son, 1926)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1888)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1892)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1897)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1914)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1916)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1918)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1896)

Pamphlets on forest protection (1900)

Pamphlets on forestry in Montana (1900)

Pamphlets on forestry in Nebraska (1900)

Pamphlets on forestry in Pennsylvania (1900)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1987)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1989)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1991)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1995)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 2002)

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Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1911)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1918)

Parasitic fungi of Illinois. Part II, Erysipheae, Lév - Earle, F. S. (Franklin Sumner), 1856 -1929 (J.W. Franks & Sons, 1887)

Parasitic fungi of Illinois / by T.J. Burrill - Earle, F. S. (Franklin Sumner), 1856 -1929 (J. W. Franks, 1887)

Parasitology (Cambridge University Press, 1922)

Parasitology (Cambridge University Press, 1920)

Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology) - MacNeal, Ward J., 1881 -1946 (P. Blakiston's Son & Co, 1920)

Pathogenic micro-organisms; a text-book of microbiology for physicians and students of medicine - MacNeal, Ward J., 1881 -1946 (P. Blakiston's son & co, 1914)

Pathological plant anatomy - Küster, Ernst, 1874 -1953 (1913)

Pathology and therapeutics of the domestic animals - Fröhner, Eugen, 1858 -1940 (W. L. Zuill, 1895)

Peach leaf curl : its nature and treatment - Pierce, Newton Barris, 1856 -1916 (Government Printing Office, 1900)

Perithecia of Thielavia basicola Zopf in culture and the stimulation of their production by extracts from other fungi - McCormick, Florence Anna 1874 -1964 (Connecticut Agricultural Experiment Station, 1925)

Pesticides documentation bulletin - National Agricultural Library (U.S.) (National Agricultural Library, U.S. Dept. of Agriculture, #c 1965-1969, 1965)