Hi Buck, long time no hear from /forums/images/graemlins/smile.gif
If you are referring to something like a Chiltons repair manual for cars, I've not seen them for modern tractors. Plenty for the popular vintage machines though.
Like others have said, your best bet is either Deere or Ebay. I picked up all sorts of manuals for my 790 and 7 backhoe off Ebay (from another TBN member no less). As was mentioned, you do have to watch the relevancy. Typically, the manuals will cover all model variations up to the publication date. They have serial numbers covered listed. So a newer manual will cover your older model but probably not the reverse.
If you need something specific, I've got the parts catalogs for the 790, 70 loader and 7 backhoe as well as the basic owners manuals. I don't have the full up repair manuals /forums/images/graemlins/smile.gif