Ace Books 1973 Edition; Frank Frazetta art (see below) rare in high grade; undervalued classic Frazetta seriesAt the start of 1973, Ace Books released a new paperback campaign for the works of Edgar Rice Burroughs—commissioning Frank Frazetta to paint dramatic new covers after his success with Ace's Burroughs' reprints of the 1960s. This book is from the publisher's 1972 fifth printing of the Burroughs classics, with a copyright for 1973. Titles in this popular series are seldom found in high gradings.