The Book of Earths by Edna Kenton [1928]
https://www.sacred-texts.com/earth/boe/
This is a compendium of theories of the shape of the Earth, along with a great deal of ‘Earth Mystery’ lore. Richly illustrated, the Book of Earths includes many unusual theories, including Columbus’ idea that the Earth is literally pear-shaped, modern theories that the Earth was originally tetrahedral, and so on. Kenton also covers many traditional theories including the ancient Babylonians and Egyptians, Hindu and Buddhist cosmology, and those of the Peruvians, Aztecs and Mongols. She also discusses modern alternative theories such as that of Reed and Koresh. Strangely enough, she misses or ignores the modern flat earth theory of Rowbotham. This is the only apparent omission in this definitive study.
Kenton has no apparent axe to grind: this is simply a very readable survey of the literature. If you have any interest in ‘Earth mysteries’, this book is a must-read.

Index:
Title Page
Acknowledgements
Contents
Illustrations
Figures
Man’s Quest in Space
Figures of Earth
Creation of the World
Upholders of the World
The Primæval Earth
The Babylonian Universe
The Egyptian Universe
Earth-Moon Catastrophe
The Deluge
The Lost Atlantis
Lost Land of the West
Trees of the World
Mountains of the World
The Wheel of Life
Earth The Mundane Egg
Systems of the Universe
The Square Earth of Cosmas Indicopleutes
The Peruvian Universe
The Aztec Universe
Tartar-Mongol Worlds
Maps of the Earth
The Earth of Columbus
Dante’s Universe
Earth the Heart of the Cosmos
St. Hildegard’s Universe
The Earths in the Universe
Wheels upon Wheels
The World Octaves
Earth a Hollow Sphere
The Tetrahedral Earth
Bibliography