@book{27726,
	author = {Billings, Marland Pratt,},
	title = {Pegmatites of Massachusetts,},
	year = {1941.},
	series = {[Cooperative Geologic Project] Bulletin},
	address = {Boston,},
	note = {At head of title: Commonwealth of Massachusetts. Dept. of Public Works, U. S. Department of the Interior. Geological Survey.}
}