"A Gollancz eBook."
At the earth's core
Pellucidar
Tanar of Pellucidar.
The Pellucidar SF Gateway omnibus : At the earth's core, Pellucidar, Tanar of Pellucidar by Edgar Rice Burroughs. ISBN 9781473201835. Published by Gateway in 2013. Publication and catalogue information, links to buy online and reader comments.