The Gazetteer for Scotland site contains a historical perspective of Blackford, drawn from the Ordnance Gazetteer of Scotland: A Survey of Scottish Topography, Statistical, Biographical and Historical, edited by Francis H. Groome and originally published in parts by Thomas C. Jack, Grange Publishing Works, Edinburgh between 1882 and 1885.
The Familysearch.org site contains a guide to the history and major genealogical records of Scotland as they pertain to the parish of Blackford, including the Statistical Accounts, Census, Church, Civil Registration and Probate Records.