Bertram Lebhar
4 appearances across 4 restored issues — every one readable in full, free.
The Argosy, March 1907 — 1907 “King or Counterfeit?” (serial) · p.701 Read the full issue (228 pages) → 
The Argosy, Christmas 1912 — 1912 “THE MOTOR-BUS MYSTERY” (serial) · p.176 Read the full issue (276 pages) → 
Argosy, Vol. 118, No. 4 — 1920 “Pembroke's Partner” · p.531 Read the full issue (180 pages) → 
Argosy All-Story Weekly, February 5, 1921 — 1921 “Listening Eyes” (serial) · p.388 Read the full issue (146 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.