Tarzan #05: Tarzan and the Jewels of Opar

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Tarzan and the Jewels of Opar is a novel written by Edgar Rice Burroughs, the fifth in his series of books about the title character Tarzan. It first appeared in the November and December issues of All-Story Cavalier Weekly in 1916, and the first book publication was by McClurg in 1918.
The novel was written while Burroughs lived in Oak Park, Illinois, which provided the name "Opar".