USGS Hydrologic Unit Map Publications

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

HU 2 ed. 1987 Map
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.
HU 2 ed. 1974 Map
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.