http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Summary groundwater resources of Perry County, Pennsylvania
Bureau of Topographic and Geologic Survey.
vii, 70 pages : illustrations (some color) ; 23 cm. + 1 map
Text and 1 folded, col. map issued in envelope.