The Atlanta Public Library's Genealogy Department contains over 2500 books and over 500 rolls of Microfilm.  The department is maintained by the Cass County  Genealogical Society.  Volunteers from the Cass County Genealogical Society are at the  Atlanta Public Library Monday thru Friday from 1:00pm until 3:00pm and on Saturdays from 10:00am until 12:00am (or 12:00am until 2:00pm).