Railroad Archives Online
- FondsD0098 - Oscar Peterson Collection
- Cyfres03 - Great Northern Railway Company (U.S.) materials
- 002 - Timetables
- Eitem001 - Great Northern Railway (U.S.) Passenger Timetable 9-52
- Eitem002 - Great Northern Railway (U.S.) Passenger Schedule 1954
- Eitem003 - Great Northern Railway (U.S.) Timetable #43, 1937