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Use the Mobi file on these devices and readers:
all versions of the Kindle, and all versions of the Kindle app.
Use the ePub file on these devices and readers:
Sony® eReader, Kobo eReader, NOOK™, iBooks (iPad/iPhone/iPod), Stanza, Bluefire (iOS & Android).
Use the PDF file with Adobe Acrobat on a personal computer.
Shirley Andrews, author of "Atlantis: Insights From a Lost Civilization" and "Lemuria and Atlantis: Studying the Past to Survive the Future."