Semper Mars
Earth Strike
Ian Douglas
Center of Gravity
Deep Time
Pelquin's Comet
Ian Whates
The quest for Mars
Laurence Bergreen
Voyage to Mars
All That Outer Space Allowsx
Ian Sales
Empires of the sky
Anthony Terrell Seward Sampson
Die Reise zum Mars
Eric Idle
Fox on the Rhine
Douglas Niles
