Australian Bushcraft is the Granddaddy of them all
Written by the Australian Army Education Service in 1943, this book gets back to basics. Forget Bear Grylls-style urine-drinking, this is the real deal information written by old soldiers who had Been There & Done That the hard way, before helicopter rescue, before PLBs and before GPS.
Chapters cover firemaking without matches, procuring water from the environment, procuring animal and plant food by foraging and with snares, as well as developing an eye for "country".
This is back to basics without the hype. Forgotten bushcraft wisdom, some of which you just won't find in a modern military survival manual.