@article {29440,
	title = {The Cretaceous system in the western interior of North America. Proceedings of an International Symposium organized by the Geological Association of Canada and held at the University of Saskatchewan, Saskatoon, Saskatchewan, May 23-26, 1973},
	volume = {Special Paper No. 13},
	year = {1973},
	pages = {666},
	institution = {Geological Association of Canada},
	address = {Waterloo, Ont},
	author = {Caldwell, W. G. E., editor}
}
