README for PoplarRefSNPData.txt These data are from a SNP survey of Populus balsamifera. Details on genotyping and analysis of the data can be found in: Keller SR, Olson MS, Silim S, Schroeder WR, Tiffin P (2010) Genomic diversity, population structure, and migration following range expansion in the balsam poplar, Populus balsamifera. Molecular Ecology 19, 1212-1226. These data also were used to generate the Q and K matrices for association mapping used in: Olson MS, Levsen N, Soolanayakanahally RY, et al. (in review) The adaptive potential of the dominant boreal forest tree Populus balsamifera L. to phenology requirements in a warmer global climate. Molecular Ecology.