Here are some books on the topic that have been mostly translated from German.
Cell Earth Books – Concave Earth Theory – Cellular Cosmogony – Skycentrism
Cellular Cosmogony or the Earth a Concave Sphere Part 1 and 2 Universology of Koreshanity – The New Geodesy by Cyrus Teed and U.G. Morrow 1898
http://joedubs.com/wp-content/uploads/2024/10/Cellular-Cosmogony-or-the-Earth-a-Concave-Sphere-Part-1-and-2-Universology-of-Koreshanity-The-New-Geodesy-by-Cyrus-Teed-and-U.G.-Morrow-1898.pdf
Johannes Lang – Die Hohlwelttheorie (The Hollow World Theory) English translation 1938
http://joedubs.com/wp-content/uploads/2024/10/Johannes-Lang-Die-Hohlwelttheorie-The-Hollow-World-Theory-English-translation-1938.pdf
The New Worldview The Hollow World Theory Part 1 and 2 – Johannes Lang – Translated to English from German 1949
http://joedubs.com/wp-content/uploads/2024/10/The-New-Worldview-The-Hollow-World-Theory-Part-1-and-2-Johannes-Lang-Translated-to-English-from-German.pdf
The New Worldview The Hollow World Theory Part 1 – Johannes Lang – Translated Illustrations
http://joedubs.com/wp-content/uploads/2024/09/The-New-Worldview-The-Hollow-World-Theory-Part-1-Johannes-Lang-Translated-Illustrations.pdf
LANG JOHANNES : NEUPERT KARL – OUR KNOWLEDGE OF BEING (THE UNIVERSE IN THE GLOBE) (THE TRUE NATURE OF THE COSMOS)1926 with illustrations translated
http://joedubs.com/wp-content/uploads/2024/10/LANG-JOHANNES-NEUPERT-KARL-OUR-KNOWLEDGE-OF-BEING-THE-UNIVERSE-IN-THE-GLOBE-THE-TRUE-NATURE-OF-THE-COSMOS1926-with-illustrations-translated.pdf
Supreme Harmony of Universe – Endospherical Field Theory by Paolo Emilio Amico Roxas – (Italian) translated, 1990
http://joedubs.com/wp-content/uploads/2024/10/Supreme-Harmony-of-Universe-Endospherical-Field-Theory-by-Paolo-Emilio-Amico-Roxas-Italian-Translated-1990.pdf
Paolo Emilio Amico-Roxas Endospherical Field Theory Diagrams Translated
http://joedubs.com/wp-content/uploads/2024/09/Paolo-Emilio-Amico-Roxas-Endospherical-Field-Theory-Diagrams-Translated.pdf
Karl E Neupert GEOKOSMOS – WORLDVIEW OF THE FUTURE
http://joedubs.com/wp-content/uploads/2024/10/Geokosmos-Karl-Neupert-1942-Translated.pdf
World Puzzle Universe – Astronomy Under Cross-Examination by Alfred Müller 1949
http://joedubs.com/wp-content/uploads/2024/10/World-Riddle-Universe-by-Alfred-Muller-1949-.pdf
The Three Stories of the Bible by Fritz Braun – 1949
http://joedubs.com/wp-content/uploads/2024/10/The-Three-Stories-of-the-Bible-by-Fritz-Braun-1949.pdf
Fritz Tauscher -Turning Point in the World – 1997
http://joedubs.com/wp-content/uploads/2024/10/Fritz-Tauscher-Turning-Point-in-the-World-1997.pdf
Turning Point in the World by Fritz Tauscher – 1997 – Illustrations Translated (German)
http://joedubs.com/wp-content/uploads/2024/10/Turning-Point-in-the-World-by-Fritz-Tauscher-1997.pdf
The Inner World of the Cosmos by Helmut I Diehl – 2003
http://joedubs.com/wp-content/uploads/2024/10/The-Inner-World-of-the-Cosmos-by-Helmut-I-Diehl-2003.pdf
Concave Maps – Cell Earth GIF
http://joedubs.com/wp-content/uploads/2024/09/concave-maps.gif
