Some United States Post Office materials are posted on the USPS Web site. If what you want isn't there, the GPO sells most Post Office materials, including the Procurement Manual and the Domestic Mail Manual. Alternatively, call the Post Office's Corporate Information Service at 202-268-5776, 202-268-4076 and/or 202-268-2832. To locate materials for borrowing, search OCLC's WorldCat.
For questions about Post Office materials, call the Post Office library (202-268-2905).
Decisions of the Postal Service Board of Contract Appeals are available on Lexis (PUBCON;POSTAL).