http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Summary ground-water resources of Armstrong County, Pennsylvania
vii, 38 pages : illustrations, map (folded color in pocket) ; 23 cm.
by Charles W. Poth ; prepared by the U.S. Geological Survey, Water Resources Division, in cooperation with the Pennsylvania Geological Survey.
"Pennsylvania Geological Survey fourth series."