A Princess of Mars has 326 pages.
Erick John Stark: Outlaw of Mars is by Leigh Brackett. The mass market paperback has 208 pages. The book is similar to the Edgar Rice Burroughs' Princess of Mars books.
A Wizard of Mars has 560 pages.
Moving Mars has 448 pages.
Mars Life has 432 pages.
Destination Mars has 160 pages.
Marooned on Mars has 210 pages.
Return to Mars has 416 pages.
Swords of Mars has 315 pages.
The Chessmen of Mars has 375 pages.
Semper Mars has 376 pages.
Mars trilogy has 609 pages.
The Mars Project has 81 pages.