I when I first started going out in the woods the term bushcraft was unheard of at least in the US, and at that time it was called "woodscraft."
I am a firm believer no matter how long someone has done there is still always something to learn or a better way to accomplish what you are doing.
Anyways some of the books I have acquired and find worthwhile are: "Bushcraft" (previously entitled "Northern Bushcraft") by Mors Kochanski, "Camp-Lore and Woodcraft" by DC Beard, "Complete Book of Outdoor Lore" (Probably now out of print but can be found used online) by Clyde Ormond, and "Bushcraft 101" and "Advanced Bushcraft" both by Dave Canterbury.