@article {29004,
	title = {Speciation in the North American spruces and its relation to white spruce. In : White spruce : the ecology of a northern resource, proceedings of a symposium held June 21, 1971, Canadian Botanical Association, Edmonton, Alberta, edited by R. G. McMinn},
	volume = {Information Report NOR-X-40},
	year = {1972},
	pages = {1-7},
	institution = {Canadian Forestry Service},
	author = {Ogilvie, R. T.}
}
