Jim Forte operates his own Postal History Auction, please see his website.
Jim Forte supplied us with the U.S.A. Post Office Lists.
Proud Bailey - Postal History Publications
Connect to the American Philatelic Society website at www.stamps.org. From there you can access their library site (www.stamplibrary.org), as well as their online catalogue, which allows you to search all of the books in their library.