1. Adams, C. C., Burns, G. P., Hankinson, T. L., Moore, B. & Taylor, N. 1920. Plants and animals of Mt. Marcy, New York. Ecology 1: 71?94; 204?233; 274?288.
2. Allard, H. A. & Leonard, E. C. 1952. The Canaan and Stony River valleys of West Virginia: their former magnificent spruce forests, their vegetation and floristics today. Castanea 17: 1?61.
3. Antevs, E. 1932. Alpine zone of Mt. Washington. Merrill & Webber, Auburn, Maine.
4. Arris, L. L. & Eagleson, P. S. 1989. Evidence for a physiological basis for the boreal-deciduous forest ecotone in North America. Vegetatio 82: 55?58.
5. Bailey, R. G. 1978. Ecoregions of the United States. Map. United States Department of Agriculture, Forest Service.