1986 IUCN red list of threatened animals - IUCN Conservation Monitoring Centre. (International Union for Conservation of Nature and Natural Resources, 1986)

1988 IUCN red list of threatened animals (1988)

1990 IUCN red list of threatened animals (1990)

1994 IUCN red list of threatened animals (1994)

A. Ecker's und R. Wiedersheim's Anatomie des Frosches - Ecker, Alexander, 1816 -1887 (Vieweg, 1896)

Abhandlungen - Heidelberger Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Klasse. (W. de Gruyter [etc.], 1922)

Abhandlungen der Mathematisch-Physikalischen Klasse der Königlich Bayerischen Akademie der Wissenschaften - Königlich Bayerische Akademie der Wissenschaften (1912)

Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft - Senckenbergische Naturforschende Gesellschaft. (Waldemar Kramer [etc.], 1899)

Abhandlungen des Naturwissenschaftlichen Vereins (früher Zoologisch-Mineralogischen Vereins) in Regensburg - Naturwissenschaftlicher Verein Regensburg (1849)

Abstammungslehre, Systematik, Paläontologie, Biogeographie - Wettstein, Richard, Ritter von Westersheim, 1863 -1931 (B. G. Teubner, 1914)

Abstracts of Papers / Brighton and Sussex Natural History and Philosophical Society - Brighton; Sussex Natural History; Philosophical Society. (1888)

The Academy newsletter - California Academy of Sciences (The Academy, 1956)

Acta Societatis Scientiarum Fennicae - Suomen Tiedeseura ([Suomen Tiedeseura], 1913)

Actas de la Academia Nacional de Ciencias de la República Argentina en Córdoba - Academia Nacional de Ciencias en Córdoba. (La Academia, 1889)

Actes de la Société linnéenne de Bordeaux - Société Linnéenne de Bordeaux. (The Society, 1845)

Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams - Harvard University. Museum of Comparative Zoology. (Museum of Comparative Zoology, 1983)

Allgemeine Zoologie und Abstammungslehre - Plate, Ludwig, 1862 -1937 (Fischer, 1922)

The American alligator - Schmidt, Karl Patterson, 1890 -1957 (Field Museum of Natural History, 1922)

The American geologist - Winchell, N. H. 1839 -1914 (Geological Pub. Co. [etc.], 1899)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1902)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1906)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1907)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1910)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1919)

The American journal of anatomy - Wistar Institute of Anatomy; Biology. ([s.n.], 1921)

The American journal of science (J.D. & E.S. Dana, 1889)

The American journal of science (J.D. & E.S. Dana, 1890)

The American journal of science (J.D. & E.S. Dana, 1897)

The American journal of science (J.D. & E.S. Dana, 1910)

The American journal of science (J.D. & E.S. Dana, 1911)

The American journal of science (J.D. & E.S. Dana, 1915)

The American Museum journal - American Museum of Natural History (American Museum of Natural History, 1916)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1877)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1886)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1887)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1888)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1889)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1891)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1895)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1896)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1897)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1898)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1899)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1900)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1903)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1904)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1905)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1908)

The American naturalist - American Society of Naturalists. (Published for the American Society of Naturalists by the University of Chicago Press [etc.], 1922)

Amphibien und reptilien - Werner, Franz, 1867 -1939 (Strecker & Schröder, 1909)

Amphibien und reptilien - Werner, Franz, 1867 -1939 (Strecker & Schröder, 1910)

Analysis of development - Willier, Benjamin H. (Benjamin Harrison), 1890 - (Saunders, 1955)

The anatomical record - Wistar Institute of Anatomy; Biology. (A. R. Liss [etc.], 1906)