Horizon Alpha Douglas R. Mason PB 1st Ballantine (1971)

Satellite 54-Zero by Douglas R. Mason Ballantine PB 1st Print Sci-Fi Fantasy

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Horizon Alpha By Douglas R. Mason PB 1st Ballantine 1971 Sci-fi SFF McLean Art

The End Bringers Douglas R. Mason PB 1st Ballantine (1973)

Douglas R Mason - Satellite 54 - Zero - Ballantine Books - 1971 Vintage Scifi

Satellite 54 Zero Douglas R. Mason PB 1st Ballantine (1971)

PB: STARFLIGHT 3000 R W MACKELWORTH 1st edition Ballantine SF CHRIS FOSS artwork