The Flanders Ballad Collection at Middlebury College in Vermont has many fiddle tunes amongst the thousands of field recordings. Steve Green did a major study of the fiddle tunes. An abrieviated version of his monograph appeared as a paper entitled, "Fiddle Music in the Helen Hartness Flanders Ballad Collection" in the 11/12 Journal of the Country Dance and Song Society of America (New York, 1981). If you contact the Maine Folklife Center (where he was until last year), you can get his new address. He has moved to another folklife center in the West.