Journey to Mars has 543 pages.
A Wizard of Mars has 560 pages.
Destination Mars has 160 pages.
Marooned on Mars has 210 pages.
Rainbow Mars has 316 pages.
A Princess of Mars has 326 pages.
The Case for Mars has 368 pages.
An Anthropologist on Mars has 327 pages.
Mars Probes has 315 pages.
Mars Mountain has 142 pages.
Swords of Mars has 315 pages.
Return to Mars has 416 pages.
The Chessmen of Mars has 375 pages.