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https://www.noaa.gov/media/digital-library-photo/pl23theb3043jpg-0Description
Bob Pryce operating theodolite at Geographical Center of North America (Image credit: Mr. Robert A. Pryce, C&GS;)
Credit
Mr. Robert A. Pryce, C&GS;
Location
Rugby, North Dakota
Collection
Historic Coast & Geodetic Survey
Keywords
Geodesy
Triangulation