@book{24469,
	author = {Dale, T. Nelson and Eckel, Edwin C.},
	title = {Slate deposits and slate industry of the United States /},
	publisher = {Govt. Print. Off.,},
	year = {1906.},
	series = {U.S. Geological survey. Bulletin},
	address = {Washington,},
	note = {Subject series : A, Economic geology, 63.}
}