The official home site is http://www.*-*-*.com/
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Visit http://www.*-*-*.com/ ,
PSAlter, psalters, tea, and small {*filter*} animals. And stuff.  

I downloaded a pdf copy of this but unfortunately the download was corrupt.
Can anyone point me at a known good copy please?

C J Denman

Try this link:  

http://www.adobe.com/products/postscript/pdfs/PLRM.pdf