Now available on Amazon:
How Hollow is our Earth?
Halley's Amazing Theory
(Erpel's Visions - Vol. 4)
Once again, Karl-Heinz
Erpel brought up a seemingly crazy theory of a celebrated scientist
in order to verify its validity. Was it an act of tomfoolery when
Edmond Halley cooked up his theory of a hollow earth? At least our
modern scientists tend to believe this. With the experienced eye of a
visionary, Erpel investigates the true backdrop of this subterranean
story. And again, extraterrestrial visitors seem to be the answer to
all unanswerable questions!