J. U. Giesy
3 appearances across 3 restored issues — every one readable in full, free.
Adventure Magazine Cover, April 1916 — 1916 “The Signal Fire” (serial) Read the full issue (228 pages) → 
Argosy All-Story Weekly, April 16, 1921 — 1921 “Jason, Son of Jason” (serial) Read the full issue (157 pages) → 
Argosy All-Story Weekly, May 5, 1928 — 1928 “A Hard-Boiled Tenderfoot” (serial) · p.577 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.