Railroad Archives Online
- FondsD0111 - Dan Perkins Collection
- Série003 - Great Northern Railway Company (U.S.) materials
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - Diesel Locomotives
- PièceDRP001-001 - GN #3011 GP30 parked in yard at Mukilteo
- PièceDRP001-010 - GN #697 GP9 parked in GN yard at Spokane