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Harvard Map Collection, Harvard College Library. Harvard University. Library. Open Collections Program. Supan, Alexander, 1847-1920.. Ed. Holzel (Firm). (2009-10). World Atmospheric Temperature Isotherms (January), 1884 (Raster Image). [GeoTIFF]. Harvard Map Collection, Harvard College Library. Retrieved from https://geo.nyu.edu/catalog/harvard-g3201-c82-1884-s8-sheet1