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Publication Order of Pellucidar Books
| At the Earth’s Core | (1914) | Hardcover  Paperback  Kindle |
| Pellucidar | (1915) | Hardcover  Paperback  Kindle |
| Tanar of Pellucidar | (1928) | Hardcover  Paperback  Kindle |
| Tarzan at the Earth’s Core | (1929) | Hardcover  Paperback  Kindle |
| Back to the Stone Age | (1937) | Hardcover  Paperback  Kindle |
| Savage Pellucidar | (1941) | Hardcover  Paperback  Kindle |
| Land of Terror | (1944) | Hardcover  Paperback  Kindle |