Old versions of GNU Emacs

[Ben Wing]

So far I've located 18.55, 18.59, 19.22, 19.28 and onward, and patches to
run forward from 19.7 to 19.22 and 19.23 to 19.28.  Note the gap between
19.22 and 19.23 and the oddity of finding exactly the *LAST* version in the
patch series, when running patches backwards is not easy due to added and
deleted files.

Can any clever person locate some of the older intermediate versions, or any
version older than 18.55?