Links of information about Hollow Earth:
Gale Encyclopedia of Occultis and Parapsychology: http://www.answers.com/topic/hollow-earth
Wikipedia: http://en.wikipedia.org/wiki/Hollow_Earth
Researchers, writers, and other people connected to the Hollow Earth: Hank Krastman, Ph.D.; Dr. Earlyne Chaney, Diane Robbins,
Organizations
Books
Periodicals
Articles
Websites:
Branton's huge Redbook website on HE related entrances, and other HE related items:
http://www.angelfire.com/ut/branton/redbook2.html
Guide to Inner Earth, by Bruce Walton:
http://www.angelfire.com/empire/fireangel/GTIE/gtie_0-index.html
Hollow Orbs (website for All-Planets Hollow, the Yahoo group): http://www.holloworbs.com/
Rodney Cluff's Website: http://www.ourhollowearth.com/ourhollo/index.html
Hollow Earth Research Society (Danny L. Weiss) (Formerly the International Society for a Complete Earth): http://hollowearthresearch.com/hollow-earth-research-society/
HE books: http://www.think-downloads.com/