Map of St. Mary's County Showing the Topography and Election Districts (1949, revised 1959)  - Compiled from Topographic Sheets of the U.S. Geological Survey and the Corps of Engineers, U.S. Army 

 -  State of Maryland, Department of Geology, Mines and Water Resources  1949, revised 1959 
 -  40" x 42" 
<br/><br/> Large sheet map, black and white.  Discoloration pattern