Clues [v22 #4, first January 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v23 #1, second January 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v23 #4, first March 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v24 #1, second March 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v24 #2, first April 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v24 #3, second April 1931] ed. Carl Happel (20¢, pulp) Associate Editor: John Associ.
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Clues [v25 #1, second May 1931] ed. Carl Happel (Clayton Magazines, Inc., 20¢, pulp) Associate Editor: John Associ.
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