Northwest Yunnan map from J. W. and C. J. Gregory "To the Alps of Chinese Tibet" (1923)
This map, one of the resources used to build the gazetteer, shows the route of geologists J. W. and C. J. Gregory in NW Yunnan in 1922. Much of the area overlaps Joseph Rock's maps in his "The Ancient Na-khi Kingdom of Southwest China", but with variant spellings of place names.

