Edward S. Ellis
2 appearances across 2 restored issues — every one readable in full, free.
Beadle's Half Dime Library: Seth Jones; or, The Captives of the Frontier — 1877 “Seth Jones; or, The Captives of the Frontier” · p.1 Read the full issue (10 pages) → 
On the Trail of Geronimo — 1901 “On the Trail of Geronimo: Or In the Apache Country” (serial) · p.11 Read the full issue (356 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.