@article {27171,
	title = {Middle Devonian of western Canada. In : Geological history of western Canada basin, ed. by R. G. McCrossan and R. P. Glaister},
	year = {1964},
	pages = {49-59},
	institution = {Alberta Association of Petroleum Geologists},
	address = {Calgary, AB},
	author = {Grayston, L. D. and Sherwin, D. F. and Allan, J. F.}
}
