Edgar Rice Burroughs: The Descriptive Bibliography of the Ace and Ballantine/del Rey Paperback BooksThe definitive guide to two of the most prolific paperback publishers of the stories of Edgar Rice Burroughs. The book includes all known printings and variations of both the United States and Canadian editions. Images throughout show ad pages and other pertinent information. The book gives detailed information on variations of the books about such things as publishers address, ad pages, edge variations, size variations, and others.