Buffalo Bill
5 appearances across 5 restored issues — every one readable in full, free.
Beadle's Half Dime Library, No. 19 — 1877 “The Phantom Spy; The Pilot of the Prairie” (serial) · p.1 Read the full issue (16 pages) → 
Beadle's Half Dime Library, No. 55 — 1878 “Deadly-Eye, The Unknown Scout” (serial) · p.2 Read the full issue (16 pages) → 
The Border Robin Hood; or, The Prairie Rover — 1885 “The Border Robin Hood; or, The Prairie Rover” (serial) · p.2 Read the full issue (32 pages) → 
The Phantom Spy; or, The Plot of the Prairie — 1897 “The Phantom Spy; Or, The Pilot of the Prairie” (serial) · p.1 Read the full issue (16 pages) → 
Beadle's Half Dime Library No. 1038 — 1897 “Red-Hand, the Scout; Or, The Red Right Hand” (serial) · p.1 Read the full issue (16 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.