I would like to read about the folks who truly made there mark in the harp world, and really get into the history of these people and their lives and how they have had such an impact on the harp.
You can’t do better as a start than by looking for Roslyn Rensch’s three books about the history of the harp. I forget the name of the first one, but the second was “The Harp: Its History, Technique, and Repertoire” and the third is “Harps and Harpists.” Your library may have one or more of them.