Notes: | Shows dams and reservoirs, irrigation, watershed-protection and flood-prevention projects, hydroelectric power plants, conveyance facilities, navigation and flood-damage-reduction projects, wild and scenic rivers, and hydrologic units. Source: U.S. Geological Survey, 1982, Codes for the identification of hydrologic units in the United States and the Caribbean outlying areas: U.S. Geological Survey Circular 878-A, 115 p. Includes inset maps of water-resources regions, Hawaii, Alaska [ca. 1:9,500,000], Puerto Rico and Virgin Islands.
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