Changes in import duties since 1930, and related information.

MLA

United States Tariff Commission. Changes in import duties since 1930, and related information. Rev. ed. ... [Washington, U.S. Govt. Print. Off.] 1943.

APA

United States Tariff Commission. (1943). Changes in import duties since 1930, and related information. Rev. ed. ... [Washington, U.S. Govt. Print. Off.].

Chicago

United States Tariff Commission. Changes in import duties since 1930, and related information. Rev. ed. ... [Washington, U.S. Govt. Print. Off.] 1943.