Here’s the site index. This link works
http://www.rppi.org/index.shtml
Type ps 250 in the site search box and hit enter. The document will be the first on on the list.
On the whole, I find this link:
http://www.rppi.org/surtrans.html
a much better source than either of the above. Note that there are papers here that affect a number of
threads that have been topics of interest on this forum!
Thanks Overmod that should keep me busy for a while