Geologic processes at the land surface / by Howard G. Wilshire ... [et al.]. - Washington : U.S. Government Printing Office, 1996. - 41 p. : ill. (some col.), maps (some col.) ; 28 cm. - U.S. Geological Survey bulletin ; 2149 . Includes bibliographical references (p. 33-39). LC Class. No.: QE75 GB54.5 / .B9 no. 2149