New York: Ace Books, Inc., 1963. Roy Krenkel, Jr. First paperback edition, first printing. Paperback. Item #44697
Ace book number F-156. Cover art by Roy Krenkel, Jr. Cover price 40¢. The first book in the Pellucidar series. Ad for eighteen ERB titles in the rear with address for 1120 Avenue of the Americas. Light toning, else a fine unread copy.