Yale University policy prohibits librarians and curators from providing financial appraisals. Professional appraisers and booksellers can authenticate and evaluate your books and documents.

You might try contacting a book dealer belonging to the ABAA http://www.abaa.org or ILAB http://www.ilab.org if you are interested in finding out more about the value of the book. For general information about the value of your book, you may also wish to read a publication of the Rare Book & Manuscript Section, a professional society, “Your Old Books,” which is available online here: http://www.rbms.info/yob.shtml.