Scheme implementation guide

[Jonathan A Rees <JAR@MC.LCS.MIT.EDU>]

You can FTP this from "SCHEME; SCHEME IMPLS" on MC.  One of these days
I'll compress it down to fewer than 10K bytes so that it's easy for me
to mail - MC's mailer doesn't like messages bigger than that, and it's
currently almost 17K.

I still don't have information about T or MIT Scheme in that file; sure
would be nice if someone from those groups would send out a message
about status, availability, etc., hint hint.  E.g. word comes to me that
T has or will soon have the same "free software" copyright notice that
MIT Scheme does.