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- University of Arizona. Library31
- National Climatic Data Center (U.S.)29
- Arizona. State Land Department17
- Arizona. Department of Health Services10
- Arizona. Department of Public Safety. Research and Planning7
- Arizona. Department of Water Resources5
- Arizona Geological Survey2
- US Environmental Protection Agency2
- United States. Department of Agriculture.2
- United States. Environmental Protection Agency.2
- University of Arizona. Cooperative Extension2
- Arizona. Game and Fish Department1
- Central Arizona Project (U.S.)1
- United States. Forest Service.1
- United States. Geological Survey1