John C. Symmes' Hollow Earth Writings
"An
Early American Utopian Fiction"
J. O. Bailey, American Literature, Vol. 14, No. 3. (Nov., 1942), pp. 285-293
Available in JSTOR
"The
Theory of Concentric Spheres"
Wm. Marion Miller Isis, Vol. 33, No. 4 (Dec., 1941), pp. 507-514
Available in JSTOR
"The
Authorship of Symzonia: The Case for Nathaniel
Ames"
Hans-Joachim Lang and Benjamin Lease The New England Quarterly, Vol. 48, No. 2
(Jun., 1975), pp. 241-252
Available in JSTOR
John Cleves
Symmes Memorial
John Cleves Symmes at the Ohio History
Central Online Encyclopedia
John Cleves Symmes in Wikipedia
Description of Symzonia by John Cleves Symmes
"Hollow
and Habitable Within: Symmes's Theory of Earth's
Internal Structure and Polar Geography" by Duane Griffin
