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HELIOTROPES & SIGNAL LAMPS
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Coast-Geodetic-Survey
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Triangulation
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Heliotrope being used in western United States
3/18/2019 2:31:33 PM
Date:
1878?
Credit:
NOAA, B.A. Colonna Album
Location:
Western United States
Subject:
Geodesy
Subject:
Triangulation
Subject:
Lights
Subject:
Helio
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