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Order by title, catalog number if there is one, and complete price with code letter. How to find what you need on this site. We do not attempt to stock every book written on these subjects, but we do try to promote those we have personally used and found valuable and those that come highly recommended by others we know, and a few we think look interesting but we haven't had time to read yet. If there's a book you want on this subject that's not listed, feel free to ask about it anyway. Chances are we can get it for you.