TY - BOOK ID - 138575948 TI - The Chopawamsic Formation : a new stratigraphic unit in the Piedmont of northeastern Virginia AU - Southwick, D.L. AU - Reed, John C. AU - Mixon, R.B. PY - 1971 PB - Washington United States Geological Survey, Department of the Interior DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:138575948 AB - ER -