|Halley's Hollow Earth|
|Cyrus Teed’s Model of the Hollow Earth|
Links for further research:
Florida Traveler http://floridatraveler.com/koreshan-state-park/
Some information about the ‘Koreshan State Historic Site’ in Florida. It gives some background information on the hollow Earth theory.
Lock Haven University
Article with detailed information and pictures about the hollow Earth theory. Provides lots of information about various scientist that believed and supported this theory
The Hollow World of Edmond Halley http://www.dioi.org/kn/halleyhollow.htm
Focuses on the life of Sir Edmond Halley, including his contribution to the Hollow Earth Theory.