history of Unix

[Bala S. Guthy]

Hello, After I saw the question about "rc" in /etc/rc 
my intereset in other such trivia has been piqued. Does
anyone know of a good Unix reference for such questions.
i.e, is there a book on history of UNIX.

v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v
|                                                                   |
| Bala S. Guthy   aktca  bguthy at eecs.umich.edu                      |
|                                                                   |
^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^v^