@book{27453,
	author = {Penhallegon, William James, and Eckel, Edwin C.},
	title = {Barite in the Tennessee valley region /},
	year = {1938.},
	series = {Tennessee valley authority. Water control planning department. Geologic division. Geologic bulletin},
	address = {Knoxville, Tenn.,},
	note = {Photo-printed.}
}