Wahl, Kenneth L. The stream-gaging program of the U. S. Geological Survey / by Kenneth L. Wahl, Wilbert O. Thomas, Jr., and Robert M. Hirsch. - Reston, Virginia: [United States Government Printing Office], 1995. - iv, 22 p. : ill., maps ; 28 cm. - 1123 . Includes bibliographical references (p. 22). Subjects--Topical Terms: Stream measurements--United States Dewey Class. No.: 551.483