Thoman, Richard S., 1919- The geography of economic activity / Richard S. Thoman, Edgar C. Conkling [and] Maurice H. Yeates - New York : McGraw-Hill, 1968 - xii, 561 p. : ill. (part col.), maps (part col.) ; 24 cm. - McGraw-Hill series in geography . Includes index ISBN: USD 17.50 Subjects--Topical Terms: Economic geography Dewey Class. No.: 330.9