1) For catalog records, I concentrated on the open-access books published by the University of Michigan Press. I did it as quick and dirty as I could by hand, using MarcEdit to get the records by ISBN (most in LC). Then I did some minor batch processing (245$h), added the links one-by-one(!!), and added a 710 Hathitrust Digital Library.
It was only at the end that I noticed there is a URI, as opposed to a URL, e.g. http://hdl.handle.net/2027/mdp.39015062870780 instead of http://babel.hathitrust.org/cgi/pt?id=mdp.39015062870780. Apparently simple enough to fix, but I just haven't gotten around to it yet.
It would be really, really nice if somebody did all of this and put it in a file for all of us to share. I would, but my catalog is Koha 2.2.7 and the fixed fields don't come out quite right, so there would still be a lot of work for everyone.
2) My other attempt has been to use the "Extend Search" function of my catalog to automatically search the HathiTrust database, e.g. see the extend search for "Historiography" at: http://www.galileo.aur.it/opac-tmpl/npl/en/extsearch/extsearchebooks.php?q=Historiography and select "HathiTrust." At this point, you can click on "Full-View Only" and get the result.
With limited resources, I find it very difficult to do much more.
James L. Weinheimer email@example.com
Director of Library and Information Services
The American University of Rome