README: Add material and related work

README.org

@@ -53,3 +53,11 @@
        This directory contains descriptions of changes that were made
        to the TeX sources of the final draft of the Common Lisp
        specification as well as the X3J13 cleanup issues.
+
+* Material and Related Work
+
+  + [[https://golopot.github.io/tex-to-unicode/][Eric Naggum's PostScript rendering of the final draft specification]]
+
+  + [[http://www.softwarepreservation.org/projects/LISP/conference/iwoleas88/Masinter-CommonLispCleanup.pdf][Description of the activities of the X3J13 cleanup sub-committee]]
+
+  + [[https://www.cliki.net/ANSI%20Clarifications%20and%20Errata][CLiki ANSI Clarifications and Errata]]