Where There Is No Doctor: A Village Health Care Handbook
The companion books, Where There Is No Dentist and When Women Have No Doctor, are also great. User tomp has linked to them in their comment.Another great book is the US Army Special Forces Medical Handbook. I have an ancient copy, but the following link looks to be it:https://www.amazon.com/Army-Special-Forces-Medical-Handbook/...The Special Forces handbook has a wealth of field medicine for nearly every scenario from combat trauma to gynecology to dental care, as they and Civil Affairs personnel are out providing medical care to indigenous men, women, and children (when they aren't killing them).You can find free, legal PDF copies online with a little Googling. Preferably, get the most recent revision as I've been told it's been updated substantially since the IQ/AF wars.Edit: The title appears to have been updated to "Special Operations Forces Medical Handbook".