21. Transportation. Transportation of agricultural products in United States, 1920-June 1939, selected list of references relating to various phases of railway, motor, and water carrier transportation: pt. 3, Index to pts. 1 and 2; compiled by Esther M. Colvin, under direction of Mary G. Lacy, librarian. Bookmark Corporate/Agency Authors: Agricultural Economics Bureau Publisher: Agricultural Economics Bureau Date: Nov. 1939 SuDoc number: A 36.13:81/pt.3