Economic geography : by R. H. Whitbeck, Frank E. Williams, assisted by William F. Christians. a regional survey / Whitbeck, R. H. (Ray Hughes), 1871-1939. Williams, Frank E. (Frank Ernest), 1877-1960, author. Christians, William F. (William Florian), 1903-1956, author. Economic geography. HC165 .W5 1940 911.3 WHE Bibliography: p. 437-452. New York : McGraw-Hill, 1940. 1940. 1940 Text xi, 469 p. : eng South America Economic conditions 1918-