@article {36583,
	title = {Regional coalification pattern of Lower Cretaceous coal-bearing strata, Rocky Mountain Foothills and foreland, Canada},
	volume = {13},
	year = {1989},
	pages = {261-302},
	publisher = {International Journal of Coal Geology},
	author = {Kalkreuth, W. and Langenberg, W. and McMechan, M.}
}
