These are quite technical books, so for some of them you'd need to be interested in the origin and structure of the German language, not just trying to speak conversationally.
Here is an AI-generated list of some of them. You're welcome to take some or all of these as you wish.
Bachmann Mittelhochdeutsches Lesebuch
Farrell Dictionary of German
Alfred Götze, Hans Volz Frühneuhochdeutsches Lesebuch
Hammer German Grammar and Usage
Marti Grammatik der Biblisch-Aramäischen Sprache
Eggers Deutsche Sprachgeschichte I
Eggers Deutsche Sprachgeschichte II
Eggers Deutsche Sprachgeschichte III
Eggers Deutsche Sprachgeschichte IV
Scheyer, Weil A Book of German Idioms
Duden Stilwörterbuch
R.E. Keller The German Language
Stopp Manual of Modern German
Meisen Altdeutsche Grammatik
Brugmann Vergleichende Grammatik der Indogermanischen Sprachen
German language and reference books (Loud Bridge PR3)
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