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CHGIS, Harvard Yenching Institute. Regional Systems Analysis Project, UC-Davis. Zumou Yue, G. William Skinner, and Mark Henderson.. (). China Cities, County Seats and Yamen, 1820-1893. [Shapefile]. CHGIS, Harvard Yenching Institute. Retrieved from https://geo.nyu.edu/catalog/sde-columbia-chgis_chinaw_points_gbk