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Harvard Map Collection, Harvard College Library. Harvard University. Library. Open Collections Program. Duperrey, Louis-Isidore, 1786-1865.. Meyer, Joseph,1796-1856.. (2009-10). World Map Showing Isodynamic Lines, 1849 (Raster Image). [GeoTIFF]. Harvard Map Collection, Harvard College Library. Retrieved from https://geo.nyu.edu/catalog/harvard-g3201-c93-1849-d81