@article {Heinselman:1963:0015-749X:336,
	author = "Heinselman, M. L. and Roe, E. I.",
	title = "Notes: A Record of Some Pleistocene Trees and Shrubs from Itasca County, Minnesota",
	journal = "Forest Science",
	volume = "9",
	number = "3",
	year = "1963",
	abstract = "Slightly mineralized wood specimens found beneath about 100 feet of glacial drift in northern Minnesota proved more than 38,000 years old by carbon-14 dating. Present were Picea, Larix laricina, Abies balsamea, Pinus banksiana, Populus, Alnus, Vaccinium, and cones similar to Picea mariana, showing that the forests at that time were similar to those of today.",
	pages = "336-337",
	url = "http://www.ingentaconnect.com/content/saf/fs/1963/00000009/00000003/art00018"
}