A Hole in Space has 196 pages.
A Hole in Texas has 288 pages.
The Black Hole of Auschwitz has 187 pages.
That Old Ace in the Hole has 359 pages.
Space on My Hands has 224 pages.
The Skylark of Space has 218 pages.
Debatable Space has 488 pages.
The Crack in Space has 190 pages.
Doorways to Space has 206 pages.
Beachheads in Space has 320 pages.
Travelers of Space has 400 pages.
S Is for Space has 239 pages.
The Currents of Space has 217 pages.