You can buy these anywhere but if you get them here through my affiliate links I make a little money and really appreciate your support. As long as you have them when you need them.
Electronic copies are great for some things but when the trouble comes and your electronics don't work, you will be very glad that you have real books to look to for help. By trouble I mean the ordinary emergencies like power outages, floods, and downed lines. Never mind if the Zombies eat your tablet or computer! I will be adding more as I find good ones that I've read and believe have relevant material.