Forgotten Books · Kessinger Publishing, LLC
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Book of Earths 1928 | 978-0-7661-2856-9 (0-7661-2856-3) | 2003 |
| The Book of Earths: Hollow Earth, Ancient Maps, Atlantis, and Other Theories | 978-1-60506-415-4 (1-60506-415-7) | 2008 |