edited by Frederik Pohl

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Worlds of IF Science Fiction, October 1967 (Volume …

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Worlds of If Science Fiction, Vol. 13 No. 2, May 19 …

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Worlds of If Science Fiction, Vol.16 No.6, June 196 …

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Worlds of Tomorrow

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Worlds of tomorrow. No. 01 (April 1963)

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Worlds of tomorrow. No. 02 (June 1963)

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Worlds of tomorrow. No. 04 (Oct. 1963)

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Worlds of tomorrow. No. 05 (Dec. 1963)

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Worlds of tomorrow. No. 06 (Feb. 1964)

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Worlds of tomorrow. No. 07 (April 1964)