Williams, W. D. (William David) - Freshwater Isopods (Asellidae) of North America, by W.D. Williams. Biota of freshwater ecosystems identification manual no. 7Water pollution control research series

Washington, DC, U.S. Environmental Protection Agency, 1972. Hardcover. ix, 45 p. illus. 29 cm. Ex-library, Very good condition Prepared by the Oceanography and Limnology Program, Smithsonian Institution, for the Environmental Protection Agency under contract no. 14-12-894. Bibliography: p. 43-44.

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