The Crystal Frontier has 280 pages.
Greenhorn on the Frontier has 209 pages.
The Other Side of the Frontier has 234 pages.
Kings of the High Frontier has 576 pages.
The Crystal Horde has 254 pages.
The Crystal World has 221 pages.
The Crystal City has 416 pages.
Irish Crystal has 304 pages.
The Crystal Star has 309 pages.
Crystal Express has 264 pages.
A Crystal Age has 287 pages.
Crystal Rain has 352 pages.
Crystal Mask has 255 pages.