http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ground-water resources of the Lowell area, Massachusetts
1 online resource (iv, 37 pages, 3 pages of plates) : illustrations, map.
"Prepared in cooperation with the Commonwealth of Massachusetts, Department of Public Works."
Includes bibliographical references (pages 35-37).
Contributions to the hydrology of the United States
Geological Survey water-supply paper ; 1669-Y