Railroad Archives Online
- CollectionD0197 - Maple Valley Historical Society Collection
- Series001 - Burlington Northern Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- ItemP2015.06.51-072 - Burlington Northern Railroad bridge at Maple Valley, Washington in 1973.
- ItemP2015.06.53-074 - Burlington Northern Railroad bridge at Maple Valley, Washington in 1973.