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: 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
Synopsis: https://concaveearth.net/t/the-cellular-cosmogony-the-earth-a-concave-sphere-pt-i-and-ii-the-new-geodesy-by-by-koresh-teed-ulysses-g-morrow/447
Die Hohlwelttheorie (The Hollow World Theory) by Johannes Lang – English translation (1938)
http://joedubs.com/wp-content/uploads/2024/10/Johannes-Lang-Die-Hohlwelttheorie-The-Hollow-World-Theory-English-translation-1938.pdf
Synopsis: https://concaveearth.net/t/johannes-lang-die-hohlwelttheorie-the-hollow-world-theory-1938-english-translated/450
The New Worldview The Hollow World Theory Part 1 and 2 – Johannes Lang – translated to English from German (1949)
Part 1 and 2: with illustrations (dark mode)
LANG JOHANNES : NEUPERT KARL – OUR KNOWLEDGE OF BEING (THE UNIVERSE IN THE GLOBE) (THE TRUE NATURE OF THE COSMOS) with illustrations translated (1926)
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
Spanish Blog: The “Supreme Harmony of the Universe” (Endospheric Field Theory, or “Cosmocentric System”).
https://teoriaendosfericadelcampo.blogspot.com/
The Fight against the Copernican Worldview by Karl E. Neupert (1928)
GEOKOSMOS – WORLDVIEW OF THE FUTURE by Karl Neupert (1942)

http://joedubs.com/wp-content/uploads/2024/10/Geokosmos-Karl-Neupert-1942-Translated.pdf
Synopsis: https://concaveearth.net/t/geocosm-worldview-of-the-future-by-karl-neupert-1942-english-translation/449/5
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 Story Universe of the Bible by Fritz Braun (1949)
Dark Mode translation with illustrations:
Turning Point in the World by Fritz Tauscher (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
Dark Mode JoeDubs translation: https://joedubs.com/wp-content/uploads/2025/02/Inner-World-Cosmos-by-Helmut-I.-Diehl-2003-JoeDubs-DarkModeTranslation.pdf
Black on White: https://joedubs.com/wp-content/uploads/2025/02/Inner-World-Cosmos-by-Helmut-I.-Diehl-2003-JoeDubs-Black-on-White.pdf
Overview: https://concaveearth.net/t/the-inner-world-of-the-cosmos-by-helmut-diehl-2003/535
The Biblical Worldview by Unknown (Dutch translation) – 1981
Click to access The-Biblican-Worldview-Het-Bijbels-wereldbeeld-Dutch-English-Translation.pdf
Overview https://concaveearth.net/t/the-biblican-worldview-het-bijbels-wereldbeeld-english-translation/511
Geometry and Cosmos by Ernst Barthel (1939)
Geometry and Cosmos by Ernst Barthel (1939)