Brown, Nina. Ellen Churchill Semple: The Anglo-Saxons of the Kentucky Mountains, 1901. Center for Spatially Integrated Social Science. Accessed 2015-3-12. [1]Archived 2015-09-23 at the Wayback Machine
Brown, Nina. Ellen Churchill Semple: The Anglo-Saxons of the Kentucky Mountains, 1901. Center for Spatially Integrated Social Science. Accessed 2015-3-12. [1]Archived 2015-09-23 at the Wayback Machine