a) Celardo suggested by Gary L. Watson
b) Frazetta suggested by Keith Chandler. Does not look like Celardo's signed work as in #80 or Tarzan strip. Part of this story, such as the first panel on page 4 and panel 7 on page 5, looks like pure Frazetta, both pencils and inks.
c) Sinnott suggested by Saltarella.
Inks:
a) Celardo suggested by Gary L. Watson and partly concurred by Keith Chandler.
There is evidence of some Celardo inks, the face of Bily West on panel 5 of the first page, for example, with typical Celardo cross-hatching on the cheeks, but much of this story by another inker.
b) Frazetta suggested by Keith Chandler.
c) Sinnott suggested by Saltarella.