There's a book "Stack Computers - the new wave" by Philip J. Koopman, Jr. which is available online and as an ebook. See
http://users.ece.cmu.edu/~koopman/stack ... index.html
and see also this page of his which is chock-full of Forth and stack CPU resources:
http://users.ece.cmu.edu/~koopman/stack.html
(I see Brad R has referenced Koopman's work in other posts here.)
Cheers
Ed