This came up on another thread
Most US Army Field Manuals are available for free download from http://www.globalsecurity.org/military/library/policy/army/fm/
Some of them are fairly irrelevant - you are unlikely to be in possession of a plane or helicopter which can make air drops. Many, on the other hand, are worth picking up and having a read through. Some are worth printing out and laminating as part of your hard copy survival library.
Small note on print outs - if possible, print out using a laser printer, not an ink jet. The laser printer bonds the toner to the paper and they become one.
PS - read FM21-10 FIRST. You will thank me for that if you ever need it. The shit, instead of hitting the fan, gets neatly disposed of without giving you cholera.