http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
ix, 130 pages, 13 leaves of plates : illustrations, tables, diagrams, maps (2 folded in pocket) ; 23 cm.
At head of title: Pennsylvania geological survey, fourth series.
Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ; M27