read a book by greg miller called bowhunting big woods bucks.I have read it twice now and I still don't really have a clue. Mast crops help but big woods bucks do alot of browsing so a key is to be able to identify the different food sources that they browse on, which is easier said then done, and more importantly when the deer are switching from one food source to another.If their is any logging in the area that helps as the deer will gravitate to clear cuts as this provides alot of regenerated growth for browse with easy access.If you have swamp areas that is always a good start,especially during the rut as the bucks will be cruising the areas that does frequent or live and a swamp is as good as any.I can't think of any more of the book to regurgitate at the moment, if you want to give the book a read pm me your address and I will send it out(not til next week as I am on vacation this week and the book is at my office.)