Economic geography of South America, by R. H. Whitbeck, Frank E. Williams, assisted by William F. Christians. Whitbeck, R. H. (Ray Hughes), 1871-1939. Williams, Frank Ernest, 1877- joint author. Christians, William F. (William Florian), 1903-1956, joint author. Economic geography. HC165 .W5 1940 380 WHE Bibliography: p. 437-452. New York, McGraw-Hill, 1940. 1940. 1940 Text xi, 469 p. : eng South America Economic conditions 1918-