This third volume of a four-book series collecting the entire run of the "Tarzan" newspaper strip by Russ Manning presents the final two, complete daily storylines, plus four extended Sunday adventures. In the dailies from August 2, 1971 through July 29, 1972, Tarzan returns to the Earth's core, while Korak plays guide on the dangerous white water river. In the Sundays from January 24, 1971 through March 17, 1974, Tarzan travels to Pal-ul-don and Korak enters the City of Xuja.