Re: Character: John Carter of Mars
Not in an ERB-written novel so far as I know. I've read all the Mars (Barsoom) and Venus (Amtor) books. Though they are doubtless in the same universe. The character of Jason Gridley (and in a broader sense, the ERB as presented in various forewords himself) ties together John Carter, David Innes, Carson Napier, Tarzan and others.
John Carter has been to Earth, Mars, Deimos and Jupiter.
Keith "Read a lot of this stuff, but oddly, very little Tarzan" Curtis