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Edgar Rice Burroughs (2015). “TARZAN OF THE APES SERIES - Complete Collection: 25 Novels in One Volume (Illustrated): The Return of Tarzan, The Beasts of Tarzan, The Son of Tarzan, Tarzan and the Jewels of Opar, Jungle Tales of Tarzan, Tarzan the Untamed, Tarzan and the Golden Lion, Tarzan the Terrible and many more”, p.5, e-artnow