"Where There is No Doctor" is OK but really pretty thin.
I would recommend instead that you get a copy of:
"The Ships Medicine Chest and Medical Aid at Sea"
A more thorough treatment with practical instructions as opposed to advice.
It is published by the U.S. HEW. mine is the 1978 edition.
Older editions are even better. Any published between 1950 and 1970 would be really great. They actually gave some instruction in minor surgery back then.
As we got more and better radio equipment, they started doing less and less.
It used to be a textbook on your way to a masters ticket, now??