Listed is this quartet of books from the Tarzan series by Edgar Rice Burroughs.  All are hardcover Grosset & Dunlap editions.  The first is the first in the series, Tarzan of the Apes.  Book shows wear to the cover, corner wear.  Previous owner information on inside page.  Page paper shows some darkening.  Next up is Tarzan at the Earth's Core, Son of Tarzan and Return of Tarzan.  All these volumes show some wear to the covers but are over all in very good condition.  Please check the pictures and contact me if you have any questions.