The Last Space Viking has 294 pages.
The Viking Symbol Mystery has 175 pages.
"They Came on Viking Ships" by Jackie French has 240 pages.
The Viking Way - Price book - has 435 pages.
The Space Vampires has 120 pages.
Beachheads in Space has 320 pages.
Space on My Hands has 224 pages.
A Hole in Space has 196 pages.
S Is for Space has 239 pages.
The Skylark of Space has 218 pages.
Debatable Space has 488 pages.
Travelers of Space has 400 pages.
Prelude to Space has 160 pages.