Freshwater planarians (Turbellaria) of North America. Kenk, Roman, 1898- Oceanography and Limnology Program (Smithsonian Institution) United States. Environmental Protection Agency. text [Washington, U.S. Environmental Protection Agency]; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1972. eng ix, 81 p. 29 cm. Prepared by the Oceanography and Limnology Program, Smithsonian Institution, for the Environmental Protection Agency under contract no. 14-12-894. Bibliography: p. 73-77. Planaria. Platyhelminthes -- North America -- Identification.