Georectified historical aerial photographs of the Colorado River in Parker Valley, Arizona and California, acquired in 1938
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Georectified and tonally balanced aerial photographs collected in 1938 by the U.S. Bureau of Reclamation along the floodplain of the Colorado River in Parker Valley,...
经地理校正与色调平衡的航空摄影照片，由美国垦务局（U.S. Bureau of Reclamation）于1938年在帕克谷（Parker Valley）的科罗拉多河河漫滩沿线采集……
