Freshwater triclads (Turbellaria) of North America, V: the genus Polycelis.
Series: Smithsonian contributions to zoology,; no. 135; Smithsonian contributions to zoology ;; no. 135.
Publisher: Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]
Published: 1973
Place of publication: Washington
Language: eng
Number of pages: 15
Subjects: Polycelis.; Turbellaria -- North America.
Notes: Bibliography: p. 14-15.