Trewartha, Glenn T. The less developed realm : a geography of its population / Glenn T. Trewartha - New York : Wiley , 1972 - xi, 449p. : ill. ; 24 cm. Includes bibliographies. ISBN: 0471887943 0471887951 (pbk.) Subjects--Geographic Terms: Developing countries--Population Dewey Class. No.: 312 / TRE