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Motor-vehicle traffic conditions in the United States.
Letter from the secretary of agriculture, transmitting, pursuant to law, a section of a report on a study and research of motor-vehicle traffic conditions in the United States entitled "Non-uniformity of state motor-vehicle traffic laws," together with recommendations of measures for their improvement.

APA Citation

United States. Bureau of Public Roads. (1938). Motor-vehicle traffic conditions in the United States. Washington: U.S. Govt. Print. Off..

United States. Bureau of Public Roads. Motor-vehicle Traffic Conditions In the United States. Washington: U.S. Govt. Print. Off., 1938.

Warning: These citations may not always be complete (especially for serials).