Whitbeck, Ray Hughes, 1871-1939. Economic geography of South America / by R. H. Whitbeck and Frank E. Williams ; assisted by William F. Christians. - 3rd ed. - New York : McGraw-Hill, c1940. - xi, 469 p. : ill. ; 23 cm. Bibliography: p. 437-452. Includes index. Subjects--Topical Terms: Economic geography. Subjects--Geographic Terms: South America--Economic conditions--1918- Dewey Class. No.: 330.98003 / WHE 1940