TY  - BOOK
TI  - Topographic Map - Leonardtown, Maryland Quadrangle (1939, reprinted 1951 with corrections)
PY  - 1939///, reprinted 1951 with corrections
PB  - United States Department of the Interior, Geological Survey
UR  - https://tudorhall.stmaryshistory.org/maps/map-141.pdf
ER  -