Figure 6

Center of gravity migration path. (Fig. 6 was generated by the author using ArcMap 10.2 software. Township software version number is 10.2, links to https://desktop.arcgis.com/.).

Center of gravity migration path. (Fig. 6 was generated by the author using ArcMap 10.2 software. Township software version number is 10.2, links to https://desktop.arcgis.com/.).