@book{30496,
	author = {Silverman, A. J. and Harris, William L.,},
	title = {Stratigraphy and economic geology of the Great Falls-Lewistown coal field, central Montana,},
	publisher = {Montana College of Mineral Science and Technology; [for sale by Montana Bureau of Mines and Geology]},
	year = {1967.},
	series = {Montana. Bureau of Mines and Geology. Bulletin 56},
	address = {Butte,},
	note = {Prepared in cooperation with Montana University System Coal Resources Research Council.}
}