Thinking Forth – A Language and Philosophy for Solving Problems (1984) [pdf]
Let's also add a link to Loeliger's Threaded Interpretive Languages... <a href="https://archive.org/details/R.G.LoeligerThreadedInterpretiveLanguagesTheirDesignAndImplementationByteBooks1981/page/n1" rel="nofollow">https://archive.org/details/R.G.LoeligerThreadedInterpretive...</a>