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This declassified satellite image of Ulaanbaatar, Mongolia was captured on 25 September 1973 by a KH-9 HEXAGON spy satellite, during mission 1206.
Each pixel covers about 88 centimeters on the ground.
The original scene is held by the USGS EarthExplorer archive (entity ID D3C1206-400661F002).
Learn more about the HEXAGON programme on the Satellite Programs page.