A preliminary classification of Diptera, exclusive of Pupipara, based upon larval and pupal characters, with keys to imagines in certain families - Malloch, John Russell, 1875 -1963 (1917)

A preliminary list of the insects of the province of Quebec part II –Diptera (two-winged flies) - Beaulieu, Germain, 1870 -1944 (s.n, 1915)

A preliminary survey of Cutoff Creek–Clearwater River drainage - Alberta. Fish; Wildlife Division. (Alberta Fish and Wildlife Division, Fisheries Section, 1967)

Preoperational investigations of zoobenthos in southeastern Lake Michigan near the Cook nuclear plant - University of Michigan. Great Lakes Research Division. (Great Lakes Research Division, University of Michigan, 1975)

Preservation of natural features and scenic views in New York City - Clarke & Rapuano. (The Department, 1974)

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

Principles of soil microbiology - Waksman, Selman A. (Selman Abraham), 1888 -1973 (Williams & Wilkins, 1927)

Proceedings - Essex Institute. (1856)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1968)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1969)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1970)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1972)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1974)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1976)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1978)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1980)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1983)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1987)

Proceedings and transactions of the Royal Society of Canada. Délibérations et mémoires de la Société royale du Canada - Royal Society of Canada. (Société royale du Canada, 1916)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1938)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1943)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1947)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1950)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1956)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1959)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1962)

Proceedings and transactions of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (The Society, 1965)

Proceedings - Dorset Natural History and Archaeological Society - Dorset Natural History; Archaeological Society. (1877)

Proceedings : National Wilderness Research Conference, current research, Fort Collins, CO, July 23-26, 1985 - Intermountain Research Station (Ogden, Utah) (Intermountain Research Station, 1986)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1859)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1860)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1915)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1921)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1841)

Proceedings of the Acadian Entomological Society - Acadian Entomological Society. (Acadian Entomological Society, 1921)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1894)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1911)

Proceedings of the annual meeting of the New Jersey Mosquito Extermination Association - American Mosquito Control Association. (New Jersey Mosquito Extermination Association, 1916)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1921)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1979)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1998)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1892)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1904)

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1907)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1928)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1939)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1944)

Proceedings of the Bristol Naturalists' Society - Bristol Naturalists' Society (Bristol, England) (Bristol Naturalists' Society, 1981)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1920)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1921)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1927)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1933)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1936)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1966)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1965)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1969)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 2017)