Bibliographical Society of America
Click on "Bibliography on the Web" for a searchable list of bibliographical resources.
The Library of Congress
The Library of Congress offers an excellent resource for information on caring for your collections:
As well as "Preservation Frequently Asked Questions":
Colorado Antiquarian Book Seminar
Annual seminar for Dealers, Librarians and Collectors, held at Colorado College in Colorado Springs.
Rare Book School
Independent non-profit educational institute offering non-credit courses at the University of Virginia, Grolier Club, John Hopkins University, et al.
Antiquarian Booksellers Association of America
Search for books, or for book dealers, all of whom abide by the ABAA Code of Ethics.
International League of Antiquarian Booksellers
Federation of 20 National Associations of Antiquarian Booksellers. Search for books, or for book dealers, all of whom abide by the ILAB Code of Ethics.
Independent Online Booksellers Association
Search for books, or for book dealers, all of whom abide by the IOBA Code of Ethics.