Robert W. Sneddon
4 appearances across 4 restored issues — every one readable in full, free.
Argosy and Railroad Man's Magazine, Vol. 107 No. 3 — 1919 “The Pearl of Venice” · p.481 Read the full issue (196 pages) → 
Argosy, Vol. 122, No. 1 — 1920 “THE BANK OF LOVE” · p.23 Read the full issue (164 pages) → 
Argosy, Vol. 123, No. 2 — 1920 “BONDS OF BOHEMIA” · p.203 Read the full issue (158 pages) → 
Detective Fiction Weekly, July 7, 1928 — 1928 “The Blue Chrysanthemum” (serial) · p.3 Read the full issue (156 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.