Ingram in the ninth edition of the Encyclopaedia Britannica is still a valuable historical account.
Ingram, On the Opus Majus of Bacon (Dublin, 1858); Cousin, "Fragments phil.
After the 1920 census was taken the township of Chartiers, with a pop. of 5,000, was annexed, petitions were filed for the annexation of the borough of Homestead with a pop. of 20,452, and a movement was on foot for the merger of the boroughs of Wilkensburg (24,403), Ingram (4,000), Grafton (5934) and others.
In 794 or 795 he married Irmengarde, daughter of Ingram, count of Haspen.