Additional
Information: Sites providing services for booksellers.
Sites concerned with the buying and selling process, rather than books, writing and literature.
Oddvolumes.com Oddvolumes.com: A membership-based website to locate missing volumes and incomplete sets of books, magazines, and journals. Also finds missing dust jackets and book pages. (Services) http://www.oddvolumes.com/
Americana Exchange Rare Books Americana Exchange Rare Books: Worldwide book auction calendar and listings, and an extensive bibliographical database. Focus on Americana. (Services) http://www.americanaexchange.com
PK Books - Online Book Appraisals PK Books - Online Book Appraisals: Pricing service for rare and used books based on condition, ephemera values, estate collections, taxes and insurance purposes. (Services) http://www.pkbooks.com/
Bibliographic Research Bibliographic Research: Company offering evaluation and certification of old and rare books. (Services) http://www.bibliographicresearch.it/
Odd Volumes United Odd Volumes United: Dealers can make dead stock pay. Collectors can find the dust jackets that make their modern firsts fully valuable. Researchers and libraries can acquire that needed missing periodical. (Services) http://www.oddvolumesunited.com/
Additional
Information: Sites providing services for booksellers.
Sites concerned with the buying and selling process, rather than books, writing and literature. 
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