Harper, Robert A. Between two worlds : a new introduction to geography / Robert A. Harper; Theodore H. Schmudde - Boston : Houghton Mifflin, 1973. - xiii, 586 p. : ill. ; 24 cm. Include Index. ISBN: 0395120756 : Subjects--Topical Terms: Geography and travel Dewey Class. No.: 910 / HAB 1973