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HR-diag-no-text-2.svg (Wikimedia Commons)
HRDiagram.png (Wikimedia Commons)
Bohr atom model (Wikimedia Commons)
GROUND PLAN, U.S. SIGNAL STATION, UGLAAMIE, ALASKA
FRONT VIEW OF MAIN BUILDING, UNITED STATES SIGNAL STATION
VIEW OF THE STATION FROM THE WEST, WITH THE CREW OF THE “NORTH STAR” IN CAMP.
