Contains sample signatures, brief biographical sketches, and information on the identification of the first U.S. and U.K. editions for each author. The Guide to Values Regular revisions Putnam Publishing Group. A fairly massive price guide focused on modern first editions. While no price guide is perfectly accurate, the Ahearns are widely considered to be among the most knowledgeable in the field. A Comprehensive Guide Regular revisions Putnam Publishing Group.
Prices listed are almost exclusively for authors first books - generally the most valuable.
Also has much additional material of interest to both collector and bookseller. The complete set covers 1967 to 1982. While the prices are badly outdated, these records are still quite widely used. Contains over 13,000 listings. Axe, John The Secret of Collecting Girls' Series Books 2000 Hobby House Press.