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  1. 1
    Exploration of the universe
    by Abell
    Published 1987
  2. 2
    Opening the space frontier space exploration
    by SPANGENBURG
    Published 1989
  3. 3
    Spacebase 2000
    by COWLEY
    Published 1994
  4. 4
    Your spaceflight manual how you could be a tourist in space within twenty years
    by ASHFORD
    Published 1991
  5. 5
    The exploitation of space
    by FURNISS
    Published 1989
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