Frank A. Mochnant
4 appearances across 4 restored issues — every one readable in full, free.
Weird Tales, April 1926 — 1926 “The Derelict Mine” (serial) Read the full issue (146 pages) → 
Weird Tales, Vol. 7, No. 5 — 1926 “The Derelict Mine (Part 2)” (serial) · p.698 Read the full issue (148 pages) → 
Weird Tales, May 1926 — 1926 “The Derelict Mine (Part 2)” (serial) · p.698 Read the full issue (148 pages) → 
Weird Tales, Vol. VII, No. 6 — 1926 “The Derelict Mine (Conclusion)” (serial) Read the full issue (148 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.