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 Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1852)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1869)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1877)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1878)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1879)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1885)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1887)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1889)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1892)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1893)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1901)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1899)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1903)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1902)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1908)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1909)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1910)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1916)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1924)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1928)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1931)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1936)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1937)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1939)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1940)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1942)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1943)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1945)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1946)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1947)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1949)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1950)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1951)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1954)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1955)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1956)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1961)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1963)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1968)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1978)

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, 1980)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1981)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1985)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1986)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1987)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1989)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1990)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1992)