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The geomagnetic observatory at Camp Colonna on the Canada/U

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https://www.noaa.gov/media/digital-library-photo/pl23cgs02250jpg

Description

The geomagnetic observatory at Camp Colonna on the Canada/U.S. Boundary on the141st Meridian.

Display Date

1890

Keywords

Coast and Geodetic Survey

Geophysics Geomagnetism