ISBN 0441751318 books & textbook
Savage Pellucidar (Inner Earth #7) (Ace SF Classic, 75131)
Burroughs, Edgar Rice Richard Powers (front cover)
New York: Ballantine Books # U2013 2nd Printing February 1968 /1968T Mass Market Paperback
isbn-10: 0441751318 / isbn-13: 9780441751310
