Here's a late 80's and early 90's series which I only recently learned about. While we have an avalanche of Robert E. Howard material today, once it was much harder to get, especially raw Howard untouched by his later editors and modifiers.
Karl Edward Wagner was an editor dedicated to getting that material out. He did it first in the trio of volumes for Berkley books back in the later 70's and here he attempted it again by offering up in this debut volume the first publication of "The Black Stranger", at least as originally written by REH.
The full contents can be found here.
Later volumes in the series focus on other great fantasy authors, especially C.L.Moore and Wade Manly Wellman.
Doubtless if I did see these, I passed them by because of the cover art which seems a bit "punkish" for classic fantasy. There might've been a miscue here for the target audience.
The contents for volume two can be found and here and for volume three here.
Solid volumes, ones I might need to search for.