Book excerpt: Whether your collection features a hefty helping of grandmas worn, but cherished cookbooks from years past, or a few recipe-rich treasures of your own, this fact and photo-filled guide will feed any cookbook fascination. This reference, written by the owners of OldCookbooks.com serves up 1,500 American cookbooks and recipe booklets from the 20th century, complete with interesting details and historical notes about each, plus estimated values.