Books, Booksellers, Book Fairs, Publishers, etc. 

American Association of Antiquarian Booksellers.
Search for a book by author or title, browse catalogues, find an antiquarian book dealers in your state.

American Booksellers Association
Search their directory of thousands of bookstores in all 50 states, or shop with an online bookseller. Searchable by name, location, and specialty.

Association of American Publishers
Represents publishers of all sizes and types located throughout the country, and is the principal trade association of the U.S. book publishing industry

Association of American University Presses
Links to home pages of these presses..

Fetchbook
"New & used books - Find the lowest price - Compare 122 book stores, 60,000 sellers, in a click." Very useful site, arranged by book subject categories.

Global Books in Print UVA ONLY
Search for millions of English-language imprints by author, title, subject, and more. Includes the U.S., Canada, Great Britain, Australia, New Zealand, and South Africa. Includes useful Publisher's Directory. Updated monthly.

Publishers' Catalogues Home Page
Links to thousands of publishers around the world with a Web presence.