About: http://webisa.webdatacommons.org/147128372

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There is some chapters on understanding The Hollow Earth as well as what was taking place in the USA and other countries (focused mostly on 1936 but with some basic overviews back to the very late 1800s).
http://www.w3.org/ns/prov#wasQuotedFrom	rpgnow.com