Railroad Archives Online
- CollectionE0316 - Robert W. Downing Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1012 - Cartographic Materials
- Subseries Level 2001 - Maps
- ItemJSRH94979 - Burlington Northern Railroad Map of Missouri Railroads
- ItemJSRH94983 - Burlington Northern Railroad Map of Railroads in Iowa
- ItemJSRH94985 - Burlington Northern Railroad Map in North Dakota
- ItemJSRH94986 - Burlington Northern Railroad Map in Washington/Idaho
- ItemJSRH94988 - Burlington Northern Railroad Map in Wisconsin
- 8 more...