The Foxfire books ever since I was little. It's a series of books documenting traditional skills like crop growing, fiddle making, blacksmithing, plumbing, foraging, cooking, etc. as done by rural people in Appalachia. They contain all kinds of valuable information in them as well as a good source of life skills & fun hobbies. I recommend them to everyone.
Such a great series, and so well-done. I grew up in the heart of Appalachia and am forever grateful to the authors and editors for capturing/preserving so much content and knowledge that would otherwise be lost over generations.