TY  - BOOK
TI  - Topographic Map - Maryland-District of Columbia Patuxent Quadrangle (September 1906, reprinted 1934)
PY  - 1906///, reprinted 1934
PB  - United States Department of the Interior, Geological Survey 
UR  - https://tudorhall.stmaryshistory.org/maps/map-073.pdf
ER  -