MYSTERIES FROM FORGOTTEN WORLDS by Charles Berlitz

Here's Berlitz' take on pre-Ice Age super civilizations, written in his usual plodding style. Borrows heavily from Charles Hapgood and his Maps of the Ancient Sea Kings, another foundational text for the 70s boom of paranormal paperbacks. Available to read and download at archive dot org.

Dell Publishing, 1973

ATLANTIS RISING by Brad Steiger

Steiger zooms about on a whirlwind tour gathering all manner of weird things into the Atlantis Mythos, including the Shaver Mystery, Hollow Earth, and that old scamp Springheel Jack! Some wild fun, but like many of the cheaper paperbacks it would have benefited from some illustrations and/or maps.

And a lovely painted cover from Sphere Books, 1976.

Atlantis Rising is available to read and download at archive dot org.

Dell Publishing, 1973

MAPS OF THE UNKNOWN: Antarctica Exposed

From Mysteries From Forgotten Worlds by Charles Berlitz, following Charles Hapgood and his Maps of the Ancient Sea Kings. Courtesy Dell Publishing, 1973.