1975. Arizona. Department of Water Resources. An Irrigation Grandfathered Right (IGFR) is a right to irrigate land in an active management area that was legally irrigated any time between 1975 ... Arizona Department of Water Resources.
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1992. United State. Geological Survey. This data set contain a black and white digital image taken in 1992 which covers most of Arizona. The image was constructed by combining multiple f... United State. Geological Survey.