TY  - BOOK
TI  - Topographic Map - Piney Point, Maryland Quadrangle (1968, photorevised 1980)
PY  - 1968///, photorevised 1980
CY  - Washington, D.C.
PB  - United States Department of the Interior, Geological Survey
UR  - https://tudorhall.stmaryshistory.org/maps/map-202.pdf
ER  -