Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series005 - Pacific Coast Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- ItemWWAPC0442 - Pacific Coast Railroad bridge at Maple Valley, Washington in 1952.
- ItemWWAPC0443 - Pacific Coast Railroad bridge at Maple Valley, Washington in 1952.
- ItemWWAPC0444 - Pacific Coast Railroad bridge at Maple Valley, Washington in 1952.
- ItemWWAPC0465 - Pacific Coast Railroad bridge at Henrys, Washington, circa 1990.
- ItemWWAPC0477 - Pacific Coast Railroad bridge at Newcastle, Washington, circa 1928.
- ItemWWAPCN0042 - Pacific Coast Railroad bridge at Maple Valley, Washington in 1943.
- ItemWWAPCN0331 - Pacific Coast Railroad bridge at Maple Valley, Washington, circa 1940.