Donde no hay medico / Where there is no doctor.
This book helped convince me I was not going to die when I was very, very ill in a tiny village of 3,000 people India for four days. I did not enjoy reading the instructions on making a cholera bed. Great that there's a free version of it available.
http://www.kk.org/cooltools/archives/006145.php
Cool Tools: Where There Is No Doctor