Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- 5 more...
- Itemimg1172 - Great Northern Bridge at Marysville, Washington, 1987
- Itemimg1173 - Great Northern Bridge at Marysville, Washington, 1987
- Itemimg1174 - Great Northern Bridge at Ferndale, Washington, 1966
- Itemimg1175 - Great Northern Bridge at Ferndale, Washington, 1966
- Itemimg1176 - Great Northern Bridge at Priest River, Idaho, 1990
- Itemimg1177 - Great Northern Bridge at Rock Island, Washington, 1987
- Itemimg1178 - Great Northern Bridge at Rock Island, Washington, 1988
- Itemimg1179 - Great Northern Bridge at Rock Island, Washington, 1988
- Itemimg1180 - Great Northern Bridge at Rock Island, Washington, 1988
- 15 more...