A synopsis of the mammals of North America and the adjacent seas - Elliot, Daniel Giraud, 1835 -1915 ([Field Columbia Museum], 1901)

Synopsis of the parasites of vertebrates of Canada : ectoparasites of terrestrial mammals - Alberta. Animal Health Division. (Alberta Agriculture, Animal Health Division, 1986)

Synopsis of the weasels of North America - Merriam, C. Hart (Clinton Hart), 1855 -1942 (U.S. Dept. of Agriculture, Division of Ornithology and Mammalogy, 1896)

Systematic results of the study of North American land mammals to the close of the year 1900 - Miller, Gerrit S. Jr. (Gerrit Smith), 1869 -1956 (Society of Natural History, 1901)

The systematic status of Tadarida brasiliensis cynocephala and Antillean members of the Tadarida brasiliensis group, with comments on the generic name Rhizomops Legendre - Carter, Dilford C. ([Texas Tech University Press], 1990)

Systematics and evolutionary relationships of the long-eared myotis, Myotis evotis (Chiroptera:Vespertilionidae) - Manning, Richard W. (Texas Tech University Press, 1993)

Systematics and zoogeography of fossil and recent pocket gophers in Florida / by Kenneth T. Wilkins - Wilkins, Kenneth T., 1953 - (1982)

Systematics of the smooth-toothed pocket gopher, Thomomys umbrinus, in the Mexican Transvolcanic Belt - Ramírez-Pulido, José (American Museum of Natural History, 2000)

Systematisk öfversigt af de gnagande däggdjuren, glires - Lilljeborg, Wilhelm, 1816 -1908 (Kongl. Akad. boktryckeriet, 1866)

A taxonomic study of the pocket gophers of Alberta - MacDonald, Sandy James. (University of Alta., Dept. of Zoology, 1969)

Taxonomy and distribution of the mammals of New Mexico : an annotated checklist - Frey, Jennifer K. (Jennifer Kristen), 1964 - (Museum of Texas Tech University, 2004)

The taxonomy and phylogenetic relationships of the hylid frog genus Stefania - University of Kansas. Museum of Natural History. (Museum of Natural History, University of Kansas, 1984)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1949)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1950)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1951)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1952)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1953)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1954)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1958)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1959)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1960)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1962)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1968)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1970)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1971)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1972)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1976)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1977)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1980)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1984)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1986)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1987)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1988)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1989)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1990)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1993)

The Texas journal of science - Texas Academy of Science. (Texas Academy of Science, 1997)