Leo Nowak appears in 10 issues in this volume.
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Issue #10
May 1941
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Issue #11
July 1941
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Issue #12
September 1941
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Issue #13
November 1941
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Issue #14
Concerts of Doom; The Invention Thief; The Undersea City; The Lightning Master
January 1942
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Issue #15
March 1942
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Issue #16
May 1942
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Issue #17
July 1942
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Issue #18
September 1942
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Issue #19
Case of the Funny Paper Crimes
November 1942
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