Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3002 - Depots/Freighthouses
- 70 more...
- ItemWerkema531 - Northern Pacific depot off-line at Thorp, Washington, in 1999.
- ItemWerkema532 - Northern Pacific depot at Toppenish, Washington, in 2008.
- ItemWerkema533 - Northern Pacific depot at Toppenish, Washington, in 2008.
- ItemWerkema534 - Northern Pacific depot at Toppenish, Washington, in 2008.
- ItemWerkema537 - Northern Pacific depot at Walla Walla, Washington, in 2008.
- ItemWerkema538 - Northern Pacific depot at Walla Walla, Washington, in 2008.