The Daemon, the Gnu, and the Penguin

I give this a high rating because it does what it sets out to do very well.Peter Salus was involved in the history of Unix and Linux, which makes him a good guide to that history. He presents it in a straightforward and spare style, so don't expect a gripping page turner. But if you want to have good accurate data on who did what and when, this book will deliver. Also, it is a relatively quick read because of his spare style.