APA

United States Postal Service. Office of Special Assistant to the Postmaster General, . (1970). Postage stamps of the United States. An illustrated description of all United States postages and special service stamps. Washington, U.S: U.S. Govt. Print off.

Chicago

United States Postal Service. Office of Special Assistant to the Postmaster General, . 1970. Postage stamps of the United States. An illustrated description of all United States postages and special service stamps. Washington, U.S: U.S. Govt. Print off.

Harvard

United States Postal Service. Office of Special Assistant to the Postmaster General, . (1970). Postage stamps of the United States. An illustrated description of all United States postages and special service stamps. Washington, U.S: U.S. Govt. Print off.

MLA

United States Postal Service. Office of Special Assistant to the Postmaster General, . Postage stamps of the United States. An illustrated description of all United States postages and special service stamps. Washington, U.S: U.S. Govt. Print off. 1970.