That's probably a couple of different books.
The first leave no trace hiking book that I read, way back when, was Colin Fletcher's classic "The Complete Walker". I think it's up to version IV now. There is no ebook version, but it is the original backpacker's guide and has been called the Backpacker's Bible. I don't think that I would take _all_ of his advice (the original version was written back in the 70's), but there is a lot of good stuff and it's a really good read.
The Backpacker's Field Manual by Rick Curtis is probably the most inclusive book for what you are looking for. It has advice on No Trace hiking, first aid, and general backcountry skills (identify trees, light first aid). It's available in ebook format as well as paper.
The big thing to keep in mind with these books is to pick and choose what works for you.
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