Even though the Who's Who doesn't list Gustavson as a writer of the strip, Mike Kooiman and Jim Amash state in the Quality Companion that he created the strip and wrote it, so the script credit has been added by Craig Delich 2013-1-18. Also verified by Gustavson's son, Terry Gustafson.
Letterer credit courtesy of Terry Gustafson, Paul Gustavson's son.
Writer credit revised from "Joe Devlin" (presumably a typo for "John Devil") to ? by Craig Delich 2013-4-6. The Who's Who does not indicate a writing credit for John Devlin on this strip. Artist correction from Joe Devlin to Bernard Dibble, who took over this strip in 1943 from John Devlin.
Dick Mace text story.
Credits from Martin O'Hearn at http://martinohearn.blogspot.com/ ; pencils formerly attributed to Al Bryant.