Retro Combat Manual
Rex Applegate’s classic Kill or Get Killed is a widely available download with some great instructions on wrecking people. It emphasizes simple, brutal techniques to end a fight as quickly and unfairly as possible.
You might as well skip the section on handgun shooting unless you’re already knowledgeable in the subject and want to learn about methods that are not currently in favor. For handgun techniques, Massad Ayoob is a better source. Similarly, the sections on fighting in the dark that must have been written before the widespread use of flashlights are of limited use.
But if you can take the talk of minorities addicted to knife-fighting and communist-motivated mobs in stride, it’s a worthy read.