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Description
Heliotrope being used in western United States (Image credit: NOAA, B.A. Colonna Album)
Credit
NOAA, B.A. Colonna Album
Display Date
1878?
Location
Western United States
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Heliotropes & Signal Lamps
Keywords
Geodesy
Triangulation
Lights
Helio