American commodity flow : a geographical interpretation of rail and water traffic based on principles of spatial interchange /

Ullman, Edward Louis, 1912-1976

American commodity flow : a geographical interpretation of rail and water traffic based on principles of spatial interchange / by Edward L. Ullman - Seattle : University of Washington Press, 1957 - xxii, 214 p. : ill., maps ; 23 cm.

Includes bibliographical references (p. 207-213) and index


Transportation--United States


United States--Commerce

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