Population Schedules of the Sixth Census of the United States, 1840 

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