I got myself a copy of the SAS survival handbook sometime last year. It covers this topic and many others: <a href="http://www.amazon.com/SAS-Survival-Handbook-Revised-Situation/dp/0061733199/ref=sr_1_1?ie=UTF8&#38;s=books&#38;qid=1264167645&#38;sr=1-1" rel="nofollow">http://www.amazon.com/SAS-Survival-Handbook-Revised-Situatio...</a>