One of the Soldiers manuals in the military had a ton of that kind of stuff in it. Of course, we never got to see any in action on duty. A few of us did do a ton of testing with all the interesting stuff in all the literature. The motorized wenching and lifting tricks all worked. The combat engineers and boy scouts have cool primitive tech books too. Much of the improvised chemistry didn't do quite as advertised. Maybe product changes since the manual was started?