Philosophical transactions of the Royal Society of London - Royal Society (Great Britain) (Royal Society of London, 1883)

Philosophical transactions of the Royal Society of London - Royal Society (Great Britain) (Royal Society of London, 1885)

A Phylogenetic analysis and taxonomy of iguanian lizards (Reptilia, Squamata) - Etheridge, Richard, 1929 - (University of Kansas, 1989)

A phylogenetic classification of animals (for the use of students) - Herdman, W. A. Sir, (William Abbott), 1858 -1924 (Macmillan and Co, 1885)

Phylogenetic relationships of extant pelobatoid frogs (Anura:Pelobatoidea) : evidence from adult morphology - Maglia, Anne M. (Natural History Museum, The University of Kansas, 1998)

Phylogenetic studies of North American minnows : with emphasis on the genus Cyprinella (Teleostei, Cypriniformes) - Mayden, Richard L. (University of Kansas, 1989)

Phylogeny, taxonomic revision, and character evolution of the genera Chiasmocleis and Syncope (Anura, Microhylidae) in Amazonia, with descriptions of three new species - Motta, Ana Paula (American Museum of Natural History, 2014)

Die Physiologie des Kreislaufes - Tigerstedt, Robert, 1853 -1923 (Vereinigung Wissensachaftlicher Verleger Walter de Gruyter, 1921)

The physiology and pharmacology of the pituitary body - Van Dyke, Harry Benjamin, 1895 - (The University of Chicago Press, 1936)

Physis - Sociedad Argentina de Ciencias Naturales. (Asociación Argentina de Ciencias Naturales [etc.], 1915)

The pictorial museum of animated nature ... - Knight, Charles, 1791 -1873 (C. Knight, 1844)

The pictorial museum of animated nature - Knight, Charles, 1791 -1873 (C. Cox, 1844)

The pigmentary, growth and endocrine disturbances induced in the aunran tadpole by the early ablation of the pars buccalis of the hypophysis - Smith, Philip E. (Philip Edward), 1884 -1970 (Wistar institute of anatomy and biology, 1920)

The pineal organ; the comparative anatomy of median and lateral eyes, with special reference to the origin of the pineal body; and a description of the human pineal organ considered from the clinical and surgical standpoints - Gladstone, Reginald John, 1865 - (Williams & Wilkins, 1940)

The plants of Southern New Jersey with especial reference to the flora of the pine barrens and the geographic distribution of the species - Stone, Witmer. 1866 -1939 (1911)

Pointing the way : the distribution and evolution of some characters of the finger muscles of frogs - Burton, Thomas C. (American Museum of Natural History, 1998)

Popular Science Review (1880)

A popular zoology - Jenks, J. W. P. 1819 -1894 (A.S. Barnes & Company, 1887)

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 1960)

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 1979)

Postilla - Peabody Museum of Natural History. (Peabody Museum of Natural History, 2004)

Potential wildlife-highway interactions at select mile-markers along Montana Department of Transportation routes an ArcView GIS analysis - Irby, Lynn R. (Fish and Wildlife Management Program, Montana State University, 2001)

The pottery and ceramics of David and Hermia Boyd - Vader, John. (Phillip Mathews, 1977)

Practical zoölogy : an elementary text-book treating of the structure, life, history, and relations of animals - Davison, Alvin, 1868 -1915 (American Book Company, 1906)

Practical zoology for medical & junior students - Bonde, Cecil von, 1895 -1983 (W. Wood, 1922)

Preliminary amphibian and reptile survey of the Ashland District, Custer National Forest : 1995 : a report - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1996)

Preliminary amphibian and reptile survey of the Helena National Forest : 1995 : a report to USDA Forest Service - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1996)

Preliminary amphibian and reptile survey of the Lewis and Clark National Forest: 1994 - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1995)

Preliminary amphibian and reptile survey of the Sioux District of the Custer National Forest : 1994 - Montana Natural Heritage Program. (Montana Natural Heritage Program, 1995)

A preliminary catalogue of the flowering plants and higher cryptogams growing without cultivation within thirty miles of Hanover, N.H., to which is appended a list of the vertebrates of the same region - Jesup, Henry G. (Henry Griswold), 1826 -1903 (N.A. McClary, 1882)

Preliminary report of the United States Geological Survey of Montana, and portions of adjacent territories : being a fifth annual report of progress - Geological; Geographical Survey of the Territories (U.S.) (Govt. Print. Off, 1872)

Primae lineae systematis naturæ : nexui naturali omnium evolutionique progressivae per nixus reascendentes superstructi - Gori͡aninov, Pavel Fedorovich, 1796 -1865 (Typis Karoli Krajanis, 1834)

The primary factors of organic evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (The Open court publishing company, 1904)

The primary factors of organic evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (Open Court Pub. Co, 1904)

The primary factors of organic evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (The Open Court Publishing Company, 1896)

The principles of biology, by J. I. Hamaker - Hamaker, John Irvin, 1869 - (P. Blakiston, 1913)

The principles of biology - Hamaker, J. I. (John Irvin), 1869 - (P. Blakiston's Sons & Co, 1913)

Principles of economic zoölogy - Daugherty, L. S. (Lewis Sylvester) 1857 -1919 (W. B. Saunders Company, 1917)

Principles of economic zoo̤logy - Daugherty, L. S. (Lewis Sylvester) 1857 -1919 (W.B. Saunders, 1915)

Principles of economic zoölogy - Daugherty, L. S. (Lewis Sylvester) 1857 -1919 (W. B. Saunders company, 1912)

Principles of economic zoölogy - Daugherty, L. S. (Lewis Sylvester) 1857 -1919 (W. B. Saunders, 1917)

Principles of economic zoölogy - Daugherty, L. S. (Lewis Sylvester) 1857 -1919 (W.B. Saunders, 1912)

Principles of embryology - Waddington, C. H. (Conrad Hal), 1905 -1975 (Macmillan, 1956)

Principles of modern biology - Marsland, Douglas, 1899 - (Holt, Rinehart and Winston, 1899)

Principles of stratigraphy - Grabau, Amadeus W. (Amadeus William), 1870 -1946 (A.G. Seiler and company, 1913)

Principles of zoölogy : a guide for beginners - Schiedt, Richard Francis Conrad, 1859 -1951 (Examiner Printing House, 1892)

Problems and methods of research in protozoology... - Hegner, Robert William, 1880 -1942 (The Macmillan company, 1930)

Problems of fertilization - Lillie, Frank Rattray, 1870 -1947 (The University of Chicago press, 1919)

Problems of relative growth - Huxley, Julian, 1887 -1975 (L. MacVeagh, The Dial Press, 1932)

Proceedings - Essex Institute. (1856)

Proceedings - Dorset Natural History; Archaeological Society.

Proceedings and transactions of the Liverpool Biological Society - Liverpool Biological Society. (The Society, 1891)

Proceedings and transactions of the Liverpool Biological Society - Liverpool Biological Society. (The Society, 1900)