I found a listing for this book while scanning ABEbooks.com for something else - don't know how good a collection it is, but you might see if your library can get it through inter-library loan:

Rollins, Hyder E. Cavalier and Puritan-Ballads and Broadsides Illustrating the Period of the Great Rebellion 1640-1660. New York University Press. First Edition VG. NY. 1923. 532pp. Illus. Hardcover.