Here's a few more:

Cohen, Norm / Long Steel Rail

Dugaw, Diane / Warrior Women and Popular Balladry, 1650-1850

Gammon, Vic / Desire, Drink, and Death in English Folk and Vernacular Song, 1600-1900

Green, Archie / Only A Miner; plus other books on folk arts, labor culture, etc. and dozens of essays published throughout his career.

Van Der Merwe / Origins of the Popular Style

Whisnant, David / All That Is Native and Fine: The Politics of Culture in an American Region