All sources, in their respective directories,
derived from the sources of the following
antiquated operating systems:
	•	Research UNIX Version 7 (v7)
	•	Research UNIX Version 8 (v8)
	•	BSD version 4.2 (4.2)
A diff(1) file is provided for each modified
source, for cross-referencing, analysis, and like
purposes.  Contact me (../README) to make
suggestions, requests, etc..