Here are (4) Great Northern Reference Sheets from the Great Northern Historical Society. Reference Sheets include: 187 (March 1992) Great Northern Standard Signs Part V, 188 (June 1992) Great Northern Caboose Cars 30' Caboose Car No X-310 (Steel Exterior), 189 (June 1992) Great Northern Hopper Cars Multi-service Series 78000-78299, 190 (June 1992) The Great Northern Empire Builder Part 2: 1947-1951. Used and in good condition. We combine shipping on multiple items.