Here are (4) Great Northern Reference Sheets from 1983. Sheets include: 79 (June 1983) Great Northern Lines East Freight Operations, 80 (June 1983) Great Northern Diesel Switcher Baldwin VO-1000 Class SW-5, 81 (June 1983) Great Northern Piggyback Operations 1954-1970, 82 (September 1983) ALCO/GE RS-1 GN Class RS-3. Used and in good condition. We combine shipping on multiple items.