Ameerika Ühendriikide riiklik programm, et saada pilvevabad aerofotod 20 000 jala kõrgusel keskmisest maastiku kõrgusest mõõtkavas 1:40 000
program of the United States that to acquire cloud-free aerial photographs at an altitude of 20 000 feet above mean terrain elevation at a scale of 1:40 000
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