TY  - BOOK
TI  - Topographic Map - Charlotte Hall, Maryland Quadrangle (1953, photorevised 1974)
PY  - 1953///, photorevised 1974
CY  - Washington, D. C.
PB  - United States Department of the Interior, Geological Survey
UR  - https://tudorhall.stmaryshistory.org/maps/map-218.pdf
ER  -