Publication date is used as on the sale date came from the Catalog of Copyright Entries, Part 1, Books, Group 1, New Series, Volume 26, For the Year 1929, Numbers 1-153. Copyright number A 10771. Copyright given to Edgar Rice Burroughs, Inc.. Affidavit of publication arrived at Copyright Office on September 4, 1929. Two copies of publication arrived at Copyright Office on August 15, 1929.