The Whittaker Library has several publications by the Highland Music Trust - they're transcriptions of old fiddle collections. See the list here.
Did you know you can also access these collections online via IMSLP, otherwise known as the Petrucci Music Library?
For example, Jane Fraser Morison's Highland Airs and Quicksteps of 1882
IMSLP homepage - http://imslp.org/wiki/Main_Page
Highland Music Trust collections on IMSLP