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2012. Patterson, Tom and Kelso, Nathaniel Vaughn. This polyline shapefile represents roads worldwide. The data was derived from a database at 1:1,000,000 scale (but holds up to 1:250,000 scale), co... North American Cartographic Information Society.
1931. Virtual Shanghai Project and Jihyun Geographical Institute. This layer is a georeferenced image of a map of Shanghai (originally titled '新上海地圖 /Xin shanghai ditu') that was published in 1931. It shows histor... Virtual Shanghai Project.