I e-mailed Steve Holland, editor of the Rick Random book mentioned a few days ago, and he has kindly provided the full details of Harry Harrison’s contributions to the Rick Random comics:
“Harry Harrison wrote four stories in total: Rick Random and the Space Pirates (Super Detective 127, May 1958, art by Ron Turner) Rick Random’s Perilous Mission (Super Detective 129, June 1958, art by Ron Turner) Rick Random and the Mystery of the Knights of Space (Super Detective 139, November 1958, art by Ernest Ratcliff) Rick Random and the Terror from Space (Super Detective 143, January 1959, art by Ron Turner)
“The first two were included in the reprint and the last was supposed to be, but they reprinted Killer in Space instead. If you look on page 652 you’ll see the cover for Terror from Space with the wrong information that it was reprinted as Killer from Space, a note helpfully (but erroneously) inserted by someone at Prion. Killer in Space was actually a reprint of the very first Rick Random story, Crime Rides the Spaceways.”
This information was taken from the payment records, so should be 100% correct.
Thanks to Steve for the additional information. He says there may be a second collection of the strips if the first one sells sufficiently well, so do please go out and buy a copy today!