copyright 1971; illustrations by Frank Frazetta; Nelson Doubleday publishers, New York; hardbound; very good condition with unmarked pages; no dust jacket.
 
Description -
The Gods of Mars: John Carter makes a spectacular return to the Red Planet in search of his wife, Dejah Thoris, Princess of Helium. Landing in the Valley Dor, he witnesses a brutal attack on a party of green Martians by plant men and giant white apes, and then joins the battle--only to find himself fighting side by side with his old friend, the mighty Tars Tarkas!

The Warlord of Mars: Far to the north, in the frozen wastes of Polar Mars, lay the home of the Holy therns, sacred and inviolate. Only John Carter dared to go there to find his lost Dejah Thoris. But between him and his goal lay the bones of all who had gone before.