The Mars Project has 81 pages.
A Wizard of Mars has 560 pages.
Mars Probes has 315 pages.
Mars Mountain has 142 pages.
Journey to Mars has 543 pages.
An Anthropologist on Mars has 327 pages.
The Chessmen of Mars has 375 pages.
Semper Mars has 376 pages.
Mars trilogy has 609 pages.
Return to Mars has 416 pages.
Destination Mars has 160 pages.
Marooned on Mars has 210 pages.
Rainbow Mars has 316 pages.