Hitselberger, Mary Fitzhugh <br/><br/>
Bridge in Time, The Complete 1850 Census of Frederick County, Maryland 

 - Redwood City, CA  Monocacy Book Company  1978 
 - 686 pages 
<br/><br/><label>ISBN: </label>091386074 
<br/><br/><label>LCCN: </label>7871854 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>1. Census, Frederick County, Maryland<br/>2. Frederick County, Maryland