Although we do not appraise rare books, we are happy to refer you to the following sources:

Your Old Books, a guide from the Association of College and Research Libraries Rare Books and Manuscripts Section

Antiquarian Booksellers' Association of American, a website that includes a membership directory of rare book dealers which can be searched geographically.

ABE Books, an international website for the sale of new and used books. It is a good place to get a sense of what a book is going for on the open market.