Data from van Heerwaarden et al. 2012 Ross-IbarraJeffrey 2016 <p>SNP data from</p> <p> </p> <p>van Heerwaarden, J., M.B. Hufford, J. Ross-Ibarra. 2012. Historical genomics of North American maize. PNAS 109: 12420-12425</p>