Charles Phelps Cushing
4 appearances across 4 restored issues — every one readable in full, free.
The Argosy, Christmas 1912 — 1912 “MODERN WEAPONS” · p.190 Read the full issue (276 pages) → 
The Blue Book Magazine, May 1922 — 1922 “Save the Mail or Die” · p.32 Read the full issue (208 pages) → 
The Blue Book Magazine, August 1922 — 1922 “The Perfect Alibi” · p.38 Read the full issue (208 pages) → 
The Blue Book Magazine, September 1922 — 1922 “The Crime-Detector” · p.111 Read the full issue (204 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.