Building off what Arx said, there's a couple Big Books of How to Do Stuff that are worth consideration if only for the amount of things they teach you to do.
The Big Book of Country Know-how: useful reference on how to build and plant just about anything you'd use in the old country. It even shows you how to build a chair!
When There Is No Doctor: You won't become a brain surgeon from reading this, but it's got tons of useful, life-saving information and, importantly, diagrams and drawings.
If there were a combined version of all the National Audubon Society Field Guides, that would be worth including, but it seems none exists.