Ancient America: The Secret Mysteries of the Great Civilization Which Once Existed on the North American Continent (Unabridged‪)‬

For a long time, our scientists thought man was of comparatively modern origin - that mankind has possibly existed 50 thousand years. It is now conceded we may possibly have been on Earth for as long as a million years, or even more. 

This audiobook, dictated by the enlightened sage commander Valiant Thor (known as "The Stranger at the Pentagon") deals with the prehistory of the human race and the bearing it has had on the people of our present time.