Heliograph
Författare/Upphovsman:
Kreditera:
NOAA's Historic C&GS (Coast and Geodetic Survey) Collection. Image ID: theb1633
Kort länk:
Källa:
Upplösning:
1376 x 900 Pixel (551067 Bytes)
Beskrivning:
heliograph - Signaling with heliograph near Monument 92. Alaska - Canada border. International Boundary Commission
Licens:
Public domain
Licenskommentaren:
This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration, taken or made as part of an employee's official duties.
Mer information om licensen för bilden finns här. Senaste uppdateringen: Sun, 29 Sep 2024 20:59:03 GMT