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Heliotrope and observing instrument at Station Gatacre (secondary triangulation Picture

Heliotrope and observing instrument at Station Gatacre (secondary triangulation

Heliotrope and observing instrument at Station Gatacre (secondary triangulation. ) Heliotrope on four foot tripod.

Photo Location: Canada, Ontario, Manitoulin Island
Photo Date: 1904 July

Author: NOAA Central Library Historical Imagery U.S. Lake Survey/ NOAA

License: Public Domain Mark 1.0 (Public domain)
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16th October 2015
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