Population Schedules of the Fourth Census of the United States, 1820, Roll 45: Maryland 

 - Volume 6 
 - Washington, DC  National Archives and Records Service  1960 
<br/><br/> Queen Anne's, St. Mary's, Somerset Counties 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>1. Census<br/>2. Maryland, Census