http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Geology, structure, and thickness of hydrogeologic units in part of the Columbia Plateau, Oregon
National Regional Aquifer Systems Analysis Program (U.S.)
1 online resource (11 maps on 6 sheets) : some color.
Relief shown by contours and spot heights.
Includes text, bibliographical references, 2 ancillary maps, stratigraphic chart, and glossary.
Water-resources investigations report ; 86-4001