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Subject Hydrography

1. EPA Reach File 1, Western United States, 1982

1982. This data was prepared by the U.S. Environmental Protection Agency (EPA) in 1982 and include all hydrography shown on USGS maps having a scale of 1... United States Environmental Protection Agency.

2. Major Rivers, Arizona, 1993

1993. Data layer depicts major rivers. Converted in the fall of 1988 from USGS 1:100,000 scale DLG data to ARC format. Since then, multiple and extensive... United States Geological Survey.

3. Major Rivers, Main Stem, Primary & Secondary Tributaries, Arizona, 1988

1988. Data layer depicts all rivers and streams. Converted in the fall of 1988 from USGS 1:100,000 scale DLG data to ARC format. Since then, multiple and... Arizona State Land Department.