Butterley Company correspondence file on the purchase of the Kirton Estate from Major Ashworth Including loose plan of the estate at Kirton, valuation of tenant right in the parish of Walesby, 25 March 1934, and specification for work to be done at Elm Tree Farm, Kirton, and plan of coal workings at Loscoe Colliery [c1934] Dec 1933-Mar 1937