Harry Sinclair Drago
3 appearances across 3 restored issues — every one readable in full, free.
Argosy All-Story Weekly, October 6, 1923 — 1923 “The Avenging Shepherd” (serial) Read the full issue (196 pages) → 
Argosy All-Story Weekly, October 6, 1923 — 1923 “The Avenging Shepherd” (serial) · p.883 Read the full issue (196 pages) → 
All Western Magazine Cover — 1950 “SUNRISE ON THE CIMARRON” · p.42 Read the full issue (164 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.