I mirror what Deb said.... I got a few books through the inter-library system.. The antique librarian in my small town didn't understand what I was wanting so it took some explaining for the search criteria. I spent the deer season prior reading the books while I sat in the river bottom.
I liked 'The Art of Falconry' probably the best for an old book. As my budget is generally limited, I don't always have the extra cash for new books, but I try to get one a year. My next one is going to be American Kestrels in Modern Falconry-- Matthew Mullinex.
The CHC guide is helpful, as well as the quizlet online tests also.