United States Postal Service. Revenue, pieces, and weight by classes of mail, and special services for. U.S. Postal Service.
Chicago Style (17th ed.) CitationUnited States Postal Service. Revenue, Pieces, and Weight by Classes of Mail, and Special Services for. [Washington, D.C.]: U.S. Postal Service.
MLA (9th ed.) CitationUnited States Postal Service. Revenue, Pieces, and Weight by Classes of Mail, and Special Services for. U.S. Postal Service.
Warning: These citations may not always be 100% accurate.