Scarce first English Edition. Mars focused short story collection including: "Sleepers of Mars," "Worlds to Barter," "Invisible Monster," "Man From Earth," "The Third Vibrator." Introduction by Walter Gillings.
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Used availability for John Wyndham's Sleepers of Mars
September 1980 : UK Hardback
1973 : UK Paperback
January 1976 : UK Paperback