Clive Cussler, anything he writes, especially since meeting him and learning he's an avid gun collector and appreciates our passion.
Samuel Clemens, anything.
Sir Conan Doyle, anything.
Unintended Consequences, a must read which almost assuredly predicts the coming second civil war.
Anything related to shooting and training, especially defensive handgun related.
Looking for any and all suggestions on material for that last topic.