Goetzmann, William H. Exploration and empire : the explorer and the scientist in the winning of the American West / [by] William H. Goetzmann. - New York : Vintage Books, [1972, c1966] - xxii, 656, xviii p. : illus. ; 21 cm. Includes bibliographical references. Subjects--Geographic Terms: West (U.S.)--Discovery and exploration. Dewey Class. No.: 917.8/04