Not exactly a field guide, but has been invaluable for ID’g trees in winter. First winter I used it, and it’s great. I have an, uh, several decades old copy of this, but it’s still in print thankfully! https://shop.adventurewithkeen.com/product/winter-tree-finder-2/
I also like the Master Tree Finder guide because of its simplicity. I also have a 1970s copy of this, and I’m not sure it’s the same as the Tree Finder guide.