http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Surface water supply of the United States, 1961-65
North Atlantic slope basins. Basins from Maryland to York River
1 online resource (ix, 850 pages) : illustration, map.
"Prepared in cooperation with the states of Delaware, Maryland, New York, Pennsylvania, Virginia, and West Virginia, and with other agencies."
"U. S. Government Printing Office : 1970 O - 397-528"--Page 850.
Geological Survey water-supply paper ; no. 1903