Tarzan At The Earth's Core

Tarzan at the Earth's Core is the thirteenth book in the Tarzan series and the fourth book in the Pellucidar series. Tarzan dominates this story as several new characters are introduced who will carry on the plot in Back to the Stone Age. This book cements the Burroughs universe together as characters (notably Jason Gridley) who had appeared in the John Carter of Mars series and Carson of Venus series, now cross over into these two new book lines, proving that they all share co-existence.