Pre-1980 DEC Technical Reports/Memoranda?

Where would DEC Technical Reports prior to 1980 would be found - on the web? The following reference is one I've never sighted, thought it was referenced (as unsighted in Ross William's 1993 Painless guide to CRC posting). Wecker, S (1974). "A Table-Lookup Algorithm for Software Computation of Cyclic Redundancy Check (CRC)". Digital Equipment Corporation memorandum. or Wecker, S., "A Table-Lookup Algorithm for Software Computation of Cyclic Redundancy Check," Technical Note, Digital Equipment Corporation, January 1974. HP has "heritage" DEC/Compaq Technical Reports 1981-2002 at http://www.hpl.hp.com/techreports/Compaq-DEC/ but not earlier ones it seems. Google books and scholar show references to the paper, other papers and a book by Stuart Wecker in the 1970-80 period, but don't seem to give links to DEC Technical reports or memoranda prior to 1980. Google groups showed some people reminiscing about using the Stuart Weckers algorithm in comp.lang.lisp. I didn't see anything relevant in WorldCat or searching the Computer History Museum collection, nor from a quick glance at BitSavers. Suggestions or just ask HP?