In the 80s or early 90s I read a surprisingly deep Logo programming book whose title/authors I forget. Not Turtle Geometry, but similar in coming from MIT Lisp/Scheme/AI people. One of the projects near the end was a kind of basic proof assistant. There was some discussion of OOP. It was written to go with some particular microcomputer Logo system.
Does this ring a bell for anyone? Maayybe this book? https://www.amazon.com/gp/product/0262510693/
(Search engines have become awful for a quirky search like this.)