Microzones - It was King Arthur providing a link to Civinator's explanation. I guess lately I've been misremembering who told me what. Oh well, at least I'm thinking of "core" creators even if it's occasionally the wrong one. Gullivar Jones is not quite as well written a story as John Carter. OTOH Alan Moore did think highly enough of it to put him into LOEG. Gullivar Jones - like Edison's Conquest of Mars - is available as a free audio download from librivox.org. Wasn't aware of the crossover graphics novel - am aware of Jusko's artwork from some of his Barsoomian illustrations. & just learned that Jean-Marc Lofficier has written a novel with Gulliver Jones & E A Poe as protagonists. EDIT: May have mentioned it elsewhere but it's worth mentioning again: In The Courts of the Crimson Kings by S M Stirling.