Butterley Company correspondence file on their case against the New Hucknall Colliery Company, relating to the evidence of William Humble, mining engineer, of Skellow Hall, Doncaster Including copies of his proof, containing references to the working of Hazel Coal at Oxcroft Colliery (7 years under Humble's direction) and the working of Top Hard Coal by the Staveley Coal and Iron Company, tonnage figures for workings of Portland Colliery, July 1905-March 1910, and loose report on damages to the Portland Colliery from undermining by the New Hucknall Company Sep 1910-Nov 1910