couple more archive sites more SHTF oriented .... The ARCHIVE.ORG Manual Library : Free Texts : Free Download, Borrow and Streaming : Internet Archive Folkscanomy: A Library of Books : Free Texts : Free Download, Borrow and Streaming : Internet Archive
Please note, many links in the OP are broken or now under copy right. This thread has been a wealth of information but a chore to fix. It never got 100% edited.