[TUHS] Missing Documents for use with the Unix Time-Sharing System, Sixth Edition

All, The Unix Sixth edition programmer's manual and other documents for use with Unix time-sharing system are available online, in html and postscript form from Wolfgang Helbig's site: http://wwwlehre.dhbw-stuttgart.de/~helbig/os/v6/doc/index.html There are papers some missing from the "Documents for use with the Unix Time-Sharing System": RATFOR - A Preprocessor for Rational Fortran NROFF User's Manual A Manual for Tmg Compiler-writing Language On the Security of UNIX The M6 Macro Processor A System for Typesetting Mathematics DC - An Interactive Desk Calculator BC - An Arbitrary Precision Desk-Calculator Language The Portable C Library (on UNIX) UNIX Summary Some of these are more interesting to me than others, but I tend towards shiny objects, so there is no telling when they will be of critical interest in the future. I have done quite a bit of searching for the NROFF document and the portable C library document and while I have found related works, I haven't come across the originals for sixth edition. Do any of y'all know where any or all of these documents are archived in their original/reproduced form? Regards, Will