New York: The Clayton Magazines, Inc., June 1931 (volume 6, number 3). Octavo, single issue, cover art by Wesso[lowski], pictorial wrappers. (#175893)
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Lincoln, Nebraska: International Scientific Association, 1933 (volume 6, number 1, whole number 17). Large octavo, single issue, blue wrappers printed in black, stapled. (#176611)
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Elizabeth, New Jersey: Charles D. Hornig, September 1933 - February 1935 (volume 1, number 1 - volume 2, number 6 [whole numbers 1 - 18]). Octavo, 18 issues, printed or self wrappers. (#173494)
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Jamaica, New York, later New York, New York: Conrad H. Ruppert, later Julius Schwartz, Octavo, 19 issues, self wrappers, stapled, later pictorial or printed wrappers, stapled. (#177047)
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Round Top, NY: Bill Munster, December 1985 (number 6). Octavo, pictorial wrappers, stapled. (#173974)
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Chicago: Sun Publications, October 1938-June 1939 (volume 1, number 1-volume 2, number 6). Octavo, 9 issues, cover art by Harold Delay (1-6, 8) and Margaret Brundage (7 and 9), pictorial wrappers. (#175895)
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Lakemont, GA: Tom Collins, Fan Press, September 1972 (whole number 6). Large octavo, single issue, pictorial wrappers. (#160691)
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Chicago: Published by The Chicago Rocket Society, November 1949 (volume 1, number 6). Large octavo, single issue, mimeographed, printed wrappers, stapled as issued. (#173490)
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London: British Interplanetary Society, November 1951 (new series, volume 10, number 6). Octavo, single issue, printed wrappers, stapled. (#173484)
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New York: Liberty Magazine, Inc., May 11, 1929 (volume 6, number 18). Large octavo, single issue, pictorial wrappers. (#162799)
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New York: HM Communications, Inc., October 1979 (volume 3, number 6). Large octavo, single issue, pictorial wrappers, stapled. (#178187)
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Baltimore, MD: Mirage Publications, Winter 1963-1964 (volume 1, number 6). Large octavo, single issue, mimeographed, pictorial wrappers, stapled as issued. (#178621)
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New York: Donald A. Wollheim, October 1937 (volume 6, number 6). Small octavo, single issue, printed from typeset copy, single sheet folded to make four pages. (#92679)
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New York: Shepherd and Wollheim, September 1936 (volume 4, number 6). Small octavo, single issue, printed from typeset copy, self wrappers, stapled. (#117137)
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New York, N.Y. Donald A. Wollheim, September 1937 (volume 6, number 5). Small octavo, single issue, single sheet folded to make four pages. (#102219)
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London: Neville Beeman Limited, 1896. Octavo, single issue, numerous illustrations by Phil May, original pictorial wrappers. (#170852)
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Philadelphia: George R. Graham & Co., 1846-1847. Octavo, 9 issues, illustrations, contemporary three-quarter leather and cloth. (#174413)
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Jamaica, New York, later New York, New York: Conrad H. Ruppert, later Julius Schwartz, September 1932 (volume 1, number 1 [whole number 1]) - January 1937 [whole number 39] [note: volume numbering dropped after volume 6, number 3, whole number 37]. Large octavo, later octavo, 39 issues, self wrappers, stapled, later pictorial or printed wrappers, stapled. (#173527)
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Holyoke, MA: Columbia Publications, Inc., January 1960 (Volume 10, number 6). Small octavo, single issue, pictorial wrappers. (#176524)
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Holyoke, MA: Columbia Publications, Inc., May 1956 (Volume 6, number 6). Small octavo, single issue, pictorial wrappers. (#176523)
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Richmond: Thomas W. White, June 1839 (volume 5, number 6). Octavo, single issue, original wrappers, untrimmed, sewn. (#176622)
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London: British Interplanetary Society, October 1956-April 1960 (volume 1, number 1-volume 2, number 6). Large octavo, 15 issues, pictorial wrappers, stapled. (#173487)
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London: British Interplanetary Society, October 1956-November 1961 (volume 1, number 1-volume 3, number 6). Large octavo, 21 issues, pictorial wrappers, stapled. (#173486)
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Saginaw, Michigan: Arthur H. Rapp, November 1949 (volume 6, number 2). Large octavo, single issue, mimeographed from typewritten copy, stapled. (#177037)
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Saginaw, Michigan: Arthur H. Rapp, October 1949 (volume 6, number 1). Large octavo, single issue, mimeographed from typewritten copy, stapled. (#177036)
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Saginaw, Michigan: Arthur H. Rapp, September 1949 (volume 5, number 6). Large octavo, single issue, mimeographed from typewritten copy, stapled. (#177035)
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Kingswood, Surrey: The World's Work (1913) Ltd., Spring 1939 (number 6). Octavo, single issue, cover art by W. J. Roberts, pictorial wrappers. (#175889)
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London: Atlas Publishing and Distributing Co., Ltd., May 1943 (volume 6, number 5). Octavo, single issue, printed wrappers. (#176534)
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Frankfurt am Main: Umschau Verlag, Januar 1952-April 1955 (volume 3, number 1-volume 6, number 2). Octavo, nine issues, illustrations, (#136301)
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