'The Survival Medicine Handbook: A Guide for When Help is Not on the Way' and 'The Ultimate Survival Medicine Guide: Emergency Preparedness for ANY Disaster' by Dr Joseph Alton and his wife, a nurse, delves into the topic of when when modern medicine isn't readily available.

He does look into some previously used procedures that, while seemingly primitive now, would be better than just sitting there and dying when modern medicine isn't available.

Their website is https://www.doomandbloom.net