United States. Postmaster General. (1922). Ascertainment of cost of handling and transporting several classes of mail matter and conducting special services for purpose of making report to Joint Commission of Congress on Postal Service: Instruction letter B-2; weighing by subclasses of 2nd class entered by publishers and registered news agents and count of copies and revenues. 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 for Purpose of Making Report to Joint Commission of Congress on Postal Service: Instruction Letter B-2; Weighing by Subclasses of 2nd Class Entered by Publishers and Registered News Agents and Count of Copies and Revenues. Washington: U.S. GPO, 1922.
MLA (9th ed.) CitationUnited States. Postmaster General. Ascertainment of Cost of Handling and Transporting Several Classes of Mail Matter and Conducting Special Services for Purpose of Making Report to Joint Commission of Congress on Postal Service: Instruction Letter B-2; Weighing by Subclasses of 2nd Class Entered by Publishers and Registered News Agents and Count of Copies and Revenues. U.S. GPO, 1922.