Ran across an interesting document today. It's a list of books (many available as free PDF downloads) and web sites on "austere medicine" - handling medical conditions in places where medical professionals and hospitals aren't (and likely won't be) available. The list is maintained by a doctor who specializes in emergency medicine. The books themselves come from a number of different sources - government, military, missionary, etc.
(Because of formatting in the document you can't just click on some of the links and have your browser end up at the right place. You may need to copy & paste a link into your browser, or type it longhand.)