Keen Detective Funnies » 14 issues
Volume » Published by Centaur. Started in 1998.
Masked Marvel appears in 14 issues in this volume.
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Issue #11
v2 #7
July 1, 1939
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Issue #12
v2 #8
August 1, 1939
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Issue #13
v2 #9
September 1, 1939
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Issue #14
v2 #10
October 1, 1939
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Issue #15
v2 #11
November 1, 1939
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Issue #16
v2 #12
December 1, 1939
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Issue #17
v3 #1
January 1, 1940
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Issue #18
March 1, 1940
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Issue #19
April 1940
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Issue #20
Keen Detective Funnies
May 1940
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Issue #21
June 1, 1940
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Issue #22
July 1, 1940
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Issue #23
August 1, 1940
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Issue #24
September 1, 1940
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