http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ecological and sociocultural reconstruction in the upper Delaware Valley
Photocopy. Ann Arbor, Mich. : University Microfilms, 1985. 21 cm.
Delaware River Valley (N.Y.-Del. and N.J.)