Ancestry Library  is only available within Siouxland Libraries branches.

It provides access to more than one billion names in more than 3,000 databases, including digital images of the 1790-1930 U.S. censuses, as well as immigration, court, church and ethnic records, city directories, genealogical societies, Social Security Death Index, Civil War Pension Index, and 700 historical maps. Includes 90 million U.S. war records from 1607-1975 and gravestone details of 3.5 million deceased U.S. soldiers.

Link to Ancestry Library.