1. Alexander RB, Shearer RC, Shepperd WD (1990) Subalpine Fir. In: Burns RM, Honkala BH (eds) Silvics of North America: 1 conifers. U.S. Department of Agriculture, Washington DC
2. Allard HA, Leonard EC (1952) The Canaan and Stoney River Valleys of West Virginia, their former magnificent spruce forest, their vegetation and floristics today. Castanea 17:1–60
3. Amos W (2006) The hidden value of missing genotypes. Mol Biol Evol 23:1995–1996
4. Bakuzis EV, Hansen HL (1965) Balsam Fir: a monographic review. University of Minnesota Press, Minneapolis
5. Barton NH, Slatkin M (1986) A quasi-equilibrium theory of the distribution of rare alleles in a subdivided population. Heredity 56:409–415