Clarence E. Mulford
4 appearances across 4 restored issues — every one readable in full, free.
Argosy All-Story Weekly — 1925 “Mesquite Jenkins Comes Back” (serial) Read the full issue (172 pages) → 
Argosy All-Story Weekly, July 11, 1925 — 1925 “Hopalong Cassidy's Pal” Read the full issue (168 pages) → 
Argosy All-Story Weekly, June 13, 1925 — 1925 “Hopalong Cassidy's Pal” · p.573 Read the full issue (170 pages) → 
Argosy All-Story Weekly, June 27, 1925 — 1925 “Hopalong Cassidy's Pal” · p.883 Read the full issue (168 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.