Updates to various README files.

README.md

@@ -58,6 +58,11 @@ I have attempted to use various Git incantations to make the files
 appear to have the commit dates as recorded in the tarballs and zip
 files I received, even though they actually predate Git's invention.
 
+## Links of Possible Interest
+
+Leah Neukirchen's blog ["Remembering The Work of David Tilbrook and the
+QED Editor](https://leahneukirchen.org/blog/archive/2021/01/remembering-the-work-of-david-m-tilbrook-and-the-qed-editor.html).
+
 #### Last Updated
 
-Sun May 17 15:22:10 IDT 2020
+Mon Feb  1 07:45:07 IST 2021

multics/README.md

@@ -10,6 +10,11 @@ These files were supplied to me by Charles Anthony
 There are source files and documentation files. I have no idea
 how to build or use them.  Enjoy.
 
+## Other Links
+
+Here is [a cheat sheet for Multics QED](http://www.bitsavers.org/pdf//honeywell/multics/swenson/6906.multics-condensed-guide.pdf).
+Thanks to Doug McIlroy.
+
 #### Last Updated
 
-Mon Dec 24 18:15:00 IST 2018
+Mon Feb  1 07:54:43 IST 2021

sds-940/README.md

@@ -3,7 +3,16 @@
 ## Introduction
 
 These files were supplied to me by Lars Brinkhoff (lars AT nocrew.org).
-I have no idea where he got them.
+
+Some if not all of the files originally came from Bitsavers.org; they were
+recovered by Al Kossow (aek AT bitsavers.org).
+
+In January of 2020, Lars writes:
+
+> I got everything packaged in a zip file from Mark Emmer.  One of the
+> PDF files is identical the Bitsavers file, the other is not identical:
+> http://bitsavers.org/pdf/sds/9xx/940/901112B_940_QED_RefMan_Jan69.pdf
+> http://bitsavers.org/pdf/sds/9xx/940/ucbProjectGenie/mcjones/R-15_QED.pdf
 
 ## Contents
 
@@ -15,4 +24,4 @@ from 1969, describing QED.
 
 #### Last Updated
 
-Sun Dec 23 19:03:51 IST 2018
+Mon Feb  1 07:47:42 IST 2021