DSSSL documentation project. This is still growing, but
there's already a fair amount of useful stuff, including the
outline of a
(little more than that as yet, but it appears to be growing, and looks
as if it will be useful when it's more nearly complete).
Paul Prescod. Very clear (even if it sometimes has
overtones of Play School about it `now let's try to...'); also
pretty compact, going from assuming nothing to non-trivial programming
in a fairly short time.