Railroad Archives Online
- FondoD0036 - George Werkema Collection
- Serie001 - Burlington Northern Railroad Company
- Subserie014 - Photographs
- 003 - Railroads--Buildings and Structures
- 004 - Maintenance of Way support
- Unidad documental simpleWerkema599 - Burlington Northern buildings at Connell, Washington, in 1986.
- Unidad documental simpleWerkema600 - Burlington Northern telephone shelter at Cunningham, Washington, in 1986.
- Unidad documental simpleWerkema602 - Burlington Northern telephone shelter at Eltopia, Washington, in 1986.