Here are (4) Reference Sheets from the Great Northern Historical Society. Reference Sheets include: 239 (March 1996) Mechanical Details Of Great Northern 50000 Gallon Water Tanks, 240 (March 1996) The SP&S The GN and the NP, 241 (June 1996) Great Northern Mill Gondola Cars Series 78400-78999, 242 (June 1996) A Biography of Winold Reiss. Used and in good condition. We combine shipping on multiple items.