Vintage20Mil, a site dedicated to metal wargaming miniatures of the 60s an 70s, has some interesting history. Old school D&D enthusiasts will recognize Miniature Figurines (“Minifigs”) as one of the pioneers of D&D minis in the mid-late 1970s, and Greyhawk figures in 1980 or so, but their bread and butter was always historical wargaming minis.
The figures here are largely 20mm, rather than 25mm like the golden age Grenadier, Ral Partha, and Heritage minis, and would probably look like hobbits next to the 28, 30, even 32mm figures you see today. But “History” sections give a fascinating look at the hobby that in part spawned D&D, and the “Reviews” and “Galleries” have great pictures, an even reprints of reviews from the 60s and 70s. A real treasure trove.
If you’d like to check out some forgotten classics of fantasy literature, two quick jump-in points I found are a list of underrated fantasies from before 1937 (the year The Hobbit was published) and also the quick reviews of early pulp at Skulls in the Stars (blog mainly about science, but generally very interesting even to the lay man!)