http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Surface water supply of the United States, 1919-1920
1 online resource (vi, 257 pages) : illustrations.
"Prepared in cooperation with the States of Pennsylvania, West Virginia, Kentucky, Illinois and Tennessee."
Monongahela River Watershed (W. Va. and Pa.)
Surface water supply of the United States, 1919-1920. Part 3, Ohio River basin
Water-supply paper (Washington, D.C.) ; no. 503