Comment by abecedarius

In case it helps any, here's a mirror I put up long ago, without the MIME issue AFAIK:

http://accesscom.com/~darius/EarlyHistoryST.html

(I did it to be able to read the paper without all the distracting OCR errors/typos in the OP's version; perhaps they've been fixed since then, though they weren't at the time I sent him this.)