Lambeth Bridge - Illustrated notes on Barlow's discovery that the cast iron cylinders used in the construction of Lambeth Bridge could also be used for tunneling under the river. - http://www.vauxhallsociety.org.uk/LambethBr.html
St. Pancras Station - William Henry Barlow - Illustrated commentary on Barlow's work at St.Pancras from Barlow Genealogy. - http://www.barlowgenealogy.com/england/famous/SPancrasStation.htm
Wikipedia: William Henry Barlow - Short biography and projects completed. - http://en.wikipedia.org/wiki/William_Henry_Barlow