1. The story of maps;Brown,1949
2. A new perspective on Eratosthenes’ measurement of the Earth;Brown;The Physics Teacher,2011
3. Cartography: Thematic map design;Dent,2009
4. Dracup, J. F. (2006a). NOAA History - Stories and tales of the Coast & Geodetic Survey - Technology tales/geodetic surveys in the US the beginning and the next 100 years. Retrieved from http://www.history.noaa.gov/stories_tales/geod1.html
5. Dracup, J. F. (2006b). NOAA History - Stories and tales of the Coast & Geodetic Survey - Technology tales/geodetic surveys in the US the beginning and the next 100 years. Retrieved from http://www.history.noaa.gov/stories_tales/geodetic5.html