Railroad Archives Online
- ArkivD0197 - Maple Valley Historical Society Collection
- Serie004 - Pacific Coast Railroad Company
- Underserie014 - Photographs
- 003 - Railroads--Buildings and Structures
- 001 - Railroad bridges
- ObjektP1986.91.01-022 - Pacific Coast Railroad bridge at Maple Valley, Washington, circa 1946.
- ObjektP2000.06.03-036 - Pacific Coast Railroad bridge at Maple Valley, Washington, circa 1935 .