Unknown Worlds of Science Fiction [v1 #2, March 1975] ed. Roy Thomas (Magazine Management Co., Inc./Curtis, $1.00, 84pp, quarto, cover by Mike Kaluta) [PSP]
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Unknown Worlds of Science Fiction [v1 #3, May 1975] ed. Roy Thomas (Magazine Management Co., Inc./Curtis, $1.00, 84pp, quarto, cover by Michael Whelan) [PSP]
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Unknown Worlds of Science Fiction [v1 #4, July 1975] ed. Roy Thomas (Magazine Management Co., Inc./Curtis, $1.00, 84pp, quarto, cover by Frank Brunner) [PSP]
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Unknown Worlds of Science Fiction [v1 #5, September 1975] ed. Roy Thomas (Magazine Management Co., Inc./Curtis, $1.00, 76pp, quarto, cover by Howard Chaykin) [PSP]
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Street & Smiths Unknown (British edition) [v 4, #4, December 1940] (Atlas Publishing and Distribution Co., London, 6d, 80pp+, 6¾" x 9¼" pulp) [DG]
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Street & Smiths Unknown Worlds (British edition) [v 4, #3, Spring 1949] (Atlas Publishing and Distribution Co., London, 1/-, 64pp+, pulp) [DG]
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Street & Smiths Unknown Worlds (British edition) [v 4, #5, Winter 1949] (Atlas Publishing and Distribution Co., London, 9d, 64pp+, pulp) [DG]
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