If you're camping, sailing or otherwise distanced from medical attention, it's good to know what to do when somebody gets hurt or sick. A UK government guide, written for ships at sea, provides a great overview of first aid, injury treatment, and many other kinds of make-do medicine.Written in an explanatory style, and assuming you only have the most minimal of supplies, the Ships Captain's Medical Guide can be a little off-putting to read at a glance. There are entire chapters on sexually transmitted diseases, childbirth and the eloquently titled "The dying and the dead". These are, of course, actual concerns for captains of larger vessels, but not entirely impossible to need help with when you're on your own journeys. But the chapters on first aid, injuries, make-shift stitching and other facets of emergency medicine are great.
Consider it the most useful lunchtime reading material you'll come across today, and consider downloading it to your phone, because you never know. It's a free PDF, split into 15 chapters.