Mack Reynolds
3 appearances across 3 restored issues — every one readable in full, free.
Analog British Edition, July 1961 — 1961 “Ultima Thule” · p.6 Read the full issue (132 pages) → 
Analog Science Fiction Magazine, British Edition — 1962 “Black Man's Burden” (serial) · p.4 Read the full issue (132 pages) → 
Amazing Stories, March 1969 — 1969 “The Man in the Moon” · p.30 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.