There are book recommendation threads every once in a while, but I don't remember seeing any dedicated to /tg/-approved non-fiction.
You must have read some interesting books and articles while building settings. Time to post them.
I'll start with Ignition!, a history of rocket propellants. If some people in history have been mekboyz, it's these scientists and engineers.
From the preface (by Isaac Asimov):
"There are, after all, some chemicals that explode shatteringly, some
that flame ravenously, some that corrode hellishly, some that poison
sneakily, and some that stink stenchily. As far as I know, though, only
liquid rocket fuels have all these delightful properties combined into
one delectable whole. "
If you have ever wondered how fucking crazy gas warfare actually was, read Chemical Soldiers by Donald Richter and The Poisonous Cloud by L. F. Haber
And "The Sexual History of the World War" by Magnus Hirschfeld is definitely /tg/-related. Don't even try to deny that you want to read about German officers carrying huge concrete dildos in their bags on the front.
Also the related review article has always struck me as somehow very body horror-esque.