Gregory appears in 9 issues in this volume.
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Issue #1
The Escape
October 1, 1973
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Issue #2
The Demand
December 1, 1973
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Issue #3
Belly Laugh
February 1, 1974
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Issue #4
Now and Then!
April 1, 1974
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Issue #5
The Ultimate Freedom
June 1, 1974
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Issue #6
Bits and Pieces of a Corrupt Life
August 1, 1974
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Issue #14
The Locked Door of Harkness House!
July 1, 1975
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Issue #17
World's Greatest Gumshoe!
October 1, 1975
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Issue #22
The Kicking Man!
August 1, 1976
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