History of Northampton County (Pennsylvania) and the grand valley of the Lehigh

Ancestry.com. History of Northampton County (Pennsylvania) and the grand valley of the Lehigh [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: Heller, William Jacob,. History of Northampton County (Pennsylvania) and the grand valley of the Lehigh. Boston New York etc.: American Historical Society, 1920.