Hey MarkL, Pellucidar is by ERB, if I recall. But you win the thread by mentioning Fritz Leiber. Have you ever read Gene Wolfe?
Freegards
Wow... You're right. I haven't read them since high school, which is roughly 3 decades, so it's a miracle that I can remember it at all. But didn't Doyle also have a "primitive world" book or series?
I don't recall ever having read Gene Wolfe.
Mark