@book{25975,
	author = {Fettke, Charles R.},
	title = {Glass manufacture and the glass sand industry of Pennsylvania,},
	publisher = {J. L. L. Kuhn, printer,},
	year = {1918 [i.e.1919]},
	series = {Pennsylvania. Topographic and geologic survey. Report no. XII},
	address = {Harrisburg, Penna.,},
	note = {Cover dated 1919.}
}