About the Books
  National Geographic Books has published two Journey Into Amazing Caves companion books. Both are beautiful coffee-table-style books lavishly illustrated with shots from the film.
Journeys into the Earth is a children's book co-written by Nancy Holler-Aulenbach and Hazel Barton with children's book author Marfé Delano. Journeys into the Earth will be about Hazel and Nancy's experience exploring some of the world's most remote caves.
Caves: Exploring Hidden Realms is written by Michael Ray Taylor, a renowned caving journalist and author of Dark Life and Cave Passages. The book includes in-depth coverage of the caves and the caving expeditions seen in the film and includes essays by experts and scientists on many aspects of cave science.