800px-Heliograph.jpg (800 × 523 pixels, file size: 123 KB, MIME type: image/jpeg)
NOAA's Historic C&GS (Coast and Geodetic Survey) Collection. Image ID: theb1632
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|current||08:39, 14 May 2009||800 × 523 (123 KB)||Cmditradmin||NOAA's Historic C&GS (Coast and Geodetic Survey) Collection. Image ID: theb1632|
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