On the cause of the excretion of water on the surface of nectaries ... - Wilson, William P. (1881)

On the popular names of British plants, being an explanation of the origin and meaning of the names of our indigenous and most commonly cultivated species - Prior, R. C. Alexander (Richard Chandler Alexander), 1809 -1902 (Williams & Norgate, 1863)

The ontogeny of insects; [papers] - Ceskoslovenská akademie ved. Sekce biologicka-lékarská. (Academic Press, 1960)

Orchard green-manure crops in California - United States. Bureau of Plant Industry. (Govt. Print. Off, 1910)

Organic chemistry in its applications to agriculture and physiology - Liebig, Justus, Freiherr von, 1803 -1873 (Printed for Taylor and Walton, 1840)

Organic chemistry in its applications to agriculture and physiology - Liebig, Justus, Freiherr von, 1803 -1873 (J. Owen, 1841)

The organic constituents of higher plants: their chemistry and interrelationships - Robinson, Trevor. (Burgess Pub. Co, 1963)

Die organische Chemie in ihrer Anwendung auf Agricultur und Physiologie - Liebig, Justus, Freiherr von, 1803 -1873 (F. Vieweg, 1841)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton, 1886)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (Hafner Pub. Co, 1890)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (Appleton, 1892)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (K. Paul, Trench, 1884)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton and company, 1902)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (Paul, Trench, 1886)

Ornis - International Ornithological Committee. (Carl Gerold's Sohn, 1896)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1891)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1912)

Our farm crops. Being a popular scientific description of the cultivation, chemistry, diseases, remedies, &c., of the various crops cultivated in Great Britain and Ireland - Wilson, John, 1812 -1888 (Blackie and son, 1859)

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

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, 1912)

The oxygen requirement of plant roots in relation to soil aeration - Free, E. E. (Edward Elway), 1883 -1939 (1917)

Palestine : the physical geography and natural history of the Holy Land - Kitto, John, 1804 -1854 (Charles Knight, 1841)

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

Pamphlets on silviculture (1899)

Pan Apum, eller Afhandling om de örter, af hvilka bien hälft draga deras honung och vax - Kungl. Svenska vetenskapsakademien. (Tryckt hos Direct. Lars Salvius, 1768)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1979)

A paper on the Papilionaceous leguminosae, commonly cultivated in Great Britain - Hampshire Literary; Philosophical Society. (Printed and published by H. King, Hants Advertiser Co, 1890)

The pathogenicity and interrelationship of Pratylenchus coffeae and Phythium splendens on Chinese evergreen - Noegel, Kenneth Arlen, 1938 - (1972)

Pathogenicity of the nematodes Rotylenchulus reniformis, Helicotylenchus dihystera, and Tylenchorhynchus claytoni to shade tobacco - Ratanaworabhan, Sawart, 1936 - (1969)

Pathologische Pflanzenanatomie. In ihren Grundzügen - Küster, Ernst, 1874 -1953 (G. Fischer, 1916)

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