Mastering Forth is also an excellent book and gets deep into the subject with very clear writing and excellent diagrams. https://archive.org/details/mastering-

Mastering Forth is also an excellent book and gets deep into the subject with very clear writing and excellent diagrams. https://archive.org/details/mastering-forth-by-anderson-anita-tracy-martin-z-lib.org https://archive.org/details/mastering-forth-by-anderson-anit...