Love getting stuff like this in the mail (great OSINT resource)
Open Source Intelligence Techniques by Michael Bazzell 5th edition. I took his online Intelligence gathering course a couple of years ago and was fairly impressed. Just upgraded from the 3rd edition book that came with the course. If you want to learn great ways of gathering open source intelligence, and the proper tool set to use to do it, then you want this book.
Anyone else used/read any of Bazzell's resources?
"Hard Work Beats Talent When Talent Doesn't Work Hard" - Tim Notke