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Shriram Krishnamurthi wrote the textbook Programming Languages: Application and Interpretation, itself commonly just called PLAI. The first edition uses a dynamically typed language which is also called PLAI (but plai in code). One of the significant revisions of the second edition of PLAI (the book) was to make the language statically typed, giving Typed-PLAI (but plai-typed in code). Matthew found plai-typed to be inconsistent, so he implemented Plait (plait) in code, which can be found on GitHub. The textbook PLAI can be used as a supplemental material in Matthew's class, but he doesn't use it in a way that requires students to ever look at it.
Besides SICP and Crafting Interpreters, I'd also recommend you look at Make A Lisp (MAL): https://github.com/kanaka/mal