one possibility is buying secound hand magazines such as
SWAT (survival weaponary and techniques)
(it later became "SOAT"survival and outdoor techniques)
another option is combat and survival, old version and new version,
as you've guessed it both magazines have the military content that has typecast many bushcrafters as rambo's
but...
the information is there and it is worth while info you can still buy whole collections on ebay, and some have been sold through BCUK!
i used to collect both and kept the useful bits which now make up a sort of scrap book of pages.
also you can download a few bits, FM 21-76 is always good for a laugh, the US army survival manual.
basically otherwise it's a case of shopping in charity shops for the out of print ones!
):
