E. Phillips Oppenheim
5 appearances across 5 restored issues — every one readable in full, free.
The Cavalier: His Neighbor's Son — 1912 “Mr. Marx's Secret” (serial) · p.6 Read the full issue (6 pages) → 
The Blue Book Magazine, November 1921 — 1921 “The Great Prince Shan” (serial) · p.7 Read the full issue (212 pages) → 
The Blue Book Magazine, August 1922 — 1922 “The Evil Shepherd” (serial) · p.92 Read the full issue (208 pages) → 
The Blue Book Magazine, September 1922 — 1922 “The Evil Shepherd” (serial) · p.70 Read the full issue (204 pages) → 
Weird Tales, September 1926 — 1926 “The Tower Ghost” · p.323 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.