Is there a really good book out there that shows the different wild edibles in North America? I struggle in this area when it comes to survival. I can hunt or fish and handle dressing my own game. I can pick out a few different fruit trees or berries, and also pecans, but after that my knowledge falls off. I know it will take more than meat and a few nuts and berries to feed my family if TSHTF, so I need a good resource that I can rely on ( I am sure that there is an app, but not sure about the IPhone working when the chips are down).