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== Pranala luar ==
* ''[http://www.facstaff.bucknell.edu/dgriffin/Research/Griffin-HE_in_Science.pdf What Curiosity in the Structure: The Hollow Earth in Science] {{Webarchive|url=https://web.archive.org/web/20130818033028/http://www.facstaff.bucknell.edu/dgriffin/Research/Griffin-HE_in_Science.pdf |date=2013-08-18 }}''
* ''[https://www.loc.gov/rr/scitech/SciRefGuides/hollowearth.html Library of Congress References]''
* ''[http://www.unmuseum.org/hollow.htm The Hollow Earth]'' The UnMuseum