Pure ERB. Few books have kept me so spellbound... I haven't read these in decades and I find myself rereading them by LED light under the blanket on my kindle in the middle of the night.

BTW, there were 2 other pellucidarian books written in the 60's or 70's by another author with permission from the estate...

Pure Burroughs at his lovely best. Fast paced, marvelously peopled, and great moral foundation. Never tire of his work.