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CHALLENGERS OF THE UNKNOWN

Publishers: NATIONAL PERIODICAL PUBLICATIONS / DC COMICS
> LOGIN TO VIEW FULL ISSUE COMMENTS AND VALUES IN 9 GRADES
Dates: 1 Apr/May 1958-9 Aug/Sep 1959 (all ND in the UK); 10 Nov 1959-77 Dec/Jan 1970/71; 78 Feb 1973-80 Jun/Jul 1973; 81 Jun/Jul 1977-87 Jun/Jul 1978
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