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Description
Looking down from the top of a 50-foot tower.Triangulation party of Wilbur Porter (Image credit: NOAA, George E. Marsh Album)
Credit
NOAA, George E. Marsh Album
Display Date
1934
Location
Midwestern United States
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Bilby Steel Towers
Keywords
Geodesy
Triangulation
Towers
Bilby Steel