Historical aerial photographs of the Colorado River in Parker Valley, Arizona and California, acquired in 1947
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Digital aerial photographs of the Parker Valley region acquired in 1947, archived by the U.S. Geological Survey part of the USGS EROS Archive - Aerial Photography -...
1947年采集的帕克谷（Parker Valley）地区数字航空摄影照片，由美国地质调查局（U.S. Geological Survey, USGS）下属的EROS档案库航空摄影分支归档……
