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UFO-NACHRICHTEN (Swedish UFO Publication)
– July 1970 issue: Article, HOLE AT THE POLES.
UFO REVIEW
(See: Beckley, Timothy Green)
UFO’S ARE SAID TO ENTER THE EARTH THROUGH A TUNNEL
– WHICH EXTENDS FROM THE SOUTH POLE (UNDERGROUND) TO CHILI., Article in THE NEW ATLANTEAN JOURNAL., Winter, 1997., p. 30.
Uhey, Lee
– JOURNEY TO THE UNKNOWN., Article in THE HOLLOW HASSLE newsletter., May 1982: The story of one man’s frightening encounter with the subterranean world.