Paul Kimball has written a review of Mac Tonnies posthumously published book THE CRYPTOTERRESTRIALS:
So, what are the cryptoterrestrials? In Mac’s hypothesis, they are a race of indigenous humanoids who share this planet with us. Technologically superior in many ways (but not, perhaps, all ways), they are on the decline, even as we continue to ascend – they are, if not a dying race, then one whose time has passed. And we are the noisy, and in many ways dangerous “new” kids on the block. Unlike Vallee or Keel, Mac does not sidestep the physical reality of the UFO phenomenon – in his hypothesis, they exist in this world, literally.
Read the complete review at Paul’s blog: