Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- 13 more...
- ItemWerkema567 - Burlington Northern Yakima River bridge at Union Gap, Washington, in 2008.
- ItemWerkema568 - Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, in 2003.
- ItemWerkema569 - Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, in 2003.
- ItemWerkema570 - Burlington Northern Sheyenne River viaduct at Valley City, North Dakota, in 2003.
- ItemWerkema572 - Burlington Northern Columbia river bridge.at Vancouver, Washington, in 1982.
- ItemWerkema573 - Burlington Northern Columbia River Slough Bridge.at Vancouver, Washington, in 1982.