United States. Postmaster General. (1923). Ascertainment of cost of handling and transporting several classes of mail matter and conducting special services: Instruction letter K-T; rural delivery service. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Postmaster General. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services: Instruction Letter K-T; Rural Delivery Service. Washington: U.S. GPO, 1923.
MLA (9th ed.) CitationUnited States. Postmaster General. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services: Instruction Letter K-T; Rural Delivery Service. U.S. GPO, 1923.
Warning: These citations may not always be 100% accurate.