USGS Hydrologic Unit Map Publications

Maps that delineate units which are basically hydrographic in nature and which are used by the USGS in cataloging water data.

HU 2 ed. 1974

U.S. Geological Survey, 1974, Hydrologic unit map - 1974, State of Alaska: U.S. Geological Survey Hydrologic Unit Map 2 ed. 1974, 1 sheet, scale 1:2,500,000.

HU 2 ed. 1987

U.S. Geological Survey, 1987, Hydrologic unit map - 1987, State of Alaska: U.S. Geological Survey Hydrologic Unit Map 2 ed. 1987, 1 sheet, scale 1:2,500,000.