I received my copy of Bjo Trimble’s very cool book Star Trek Concordance. A complete episode guide to the original series. The cover also has a spinning wheel that serves as a star date reference and table of contents
This began as notes compiled by the late Dorothy J Heydt, episode by episode, as they aired. Characters, planets, ships, plots, etc. Dorothy's huge collection of index cards was expanded into a fanzine-like reference by Bjo Trimble, later becoming the book.
Heydt later wrote SF & fantasy novels.
