The Art of Saw-Filing by HW Holly is a fun little book that takes a quite complicated topic and breaks it down into a very easy to understand process – in a book which covers everything from the finest saw to a monster two-man saw to a circular saw and everything in between. It’s free in most parts of the world as teh original was published towards the end of the nineteenth century. I’ve done a separate podcast on the book with a reading of a few pages, because it was included in Handsaw Essentials, but is available on its own.
I’ve found this 52 page book to be a surprisingly useful guide to what may seem to be a dark art! If you’re contemplating sharpening your own saw, you could do a lot worse than downloading a copy of this book.