Man-Thing appears in Daredevil (Marvel, 1964 series) #113 (cameo) and #114 right around when this issue was released. On-sale date from Comic Reader (Street Enterprises, 1973 series) #109, August 1974.
This issue has variants:
Foolkiller [Ross Everbest] (cameo flashback); Ruth Hart (flashback); Man-Thing [Ted Sallis] (also in flashback); Richard Rory (also in flashback); Sybil Mills (introduction, also in flashback); Demons of Liberation (introduction, also in flashback); Snake (corpse in cameo flashback); Soul-Slayers (cameo flashback); Ed; Vic; Toby