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Secret Cities of Old South America is a 1950—1952 book by Harold T. Wilkins. Despite its title, the book covers a number of American mysteries, including cryptozoology, and features both original and quoted accounts of the giant anaconda, giant caiman, cave cow, South American elephant, and marine saurians, among other cryptids. It also accounts lost explorers, tribal myths/customs, lost contents (Mu), Atlantis, and more.