With the addition in 1989 of the G. Ross Roy Collection, the University of South Carolina's Thomas Cooper Library became a major international center for research across the broad range of Scottish literature. The core of the Roy Collection is (in the words of a recent visitor) "the best Burns collection in North America." Around that core are holdings in depth for many other major (and minor) Scottish writers, from the Renaissance to the present day, supported by the resources of a nationally-ranked research library.
University of South Carolina, "University of South Carolina Libraries - The G. Ross Roy Collection of Robert Burns, Burnsiana & Scottish Poetry at Thomas Cooper Library, University of South Carolina". http://scholarcommons.sc.edu/rbsc_pubs/3/