Railroad Archives Online
- FondsD0173A - Hal Will Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Teilserie014 - Photographs
- 004 - Railroad tracks
- 003 - Railroad yards
- ObjektMOHAI.90.24.46 - Great Northern Yard at Seattle, Washington in 1947.
- ObjektMOHAI.90.24.46.crop - Great Northern Yard at Seattle, Washington in 1947.