The Gilak's Guide to Pellucidar - Paperbackby David Critchfield (Author) The 7 book Pellucidar series was written by the master storyteller, Edgar Rice Burroughs. Those books told the story of David Innes and Abner Perry's adventures in the savage land at the Earth's core. This new book by David Critchfield is the one and only guide to Pellucidar. It's full of information about the Earth's core: articles, maps, book summaries, family trees, languages, beliefs, publishing histories, a glossary