A standard medical textbook is Wilderness Medicine (4th Edition). At 1910 pages it is hardly portable (or cheap), but the writing is clear and the topics covered are comprehensive. Even if you can't afford it, it's worth taking a peek at it at your local university library.<br><br>Here's a review:<br>http://jama.ama-assn.org/issues/v287n4/ffull/jbk0123-2.html<br><br>Here is the Amazon listing, although you can usually pick up a used one for much less:<br>http://www.amazon.com/exec/obidos/ASIN/0323009506/qid=1033492887/sr=2-2/ref=sr_2_2/104-4143012-1808711