In my opinion one of the overlooked authors from the TSR days is Rose Estes. She was a journalist as well as writing novels.
She worked for TSR for a while, and worked to bring about a series of books called “The Endless Quest” These turned out to be best sellers for months. Last I looked the Endless Quest books had been translated into more than 20 languages and sold more than 16 million copies.
She has books in multiple series, and one of the names/authors I remember fondly from the late 80s and early 90s. Every single time I came across one of hers I knew it wouldn’t disappoint. She was truly one of the female pioneers of this genre along with Margaret Weis and others I’m sure I’ll remember and post about at some later date.
In the Greyhawk books you will find an adventure novel in the World of Greyhawk game setting. Greyhawk itself began as just a simple dungeon under a castle designed by Gary Gygax himself, but it was expanded into a multi-layered dungeon, then added a city, and eventually expanded into an entire world with some novels set in that space.
Please enjoy them if you come across a copy as I have.