Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3007 - Tunnels
- ItemJMF11-10027.0 - Lewis & Clark Railway Tunnel at Battle Ground, Washington in October, 1988.
- ItemJMF23-15024.4 - Canadian Pacific Railway spiral tunnel entrance in Yoho National Park, British Columbia in August 1989.
- ItemJMF23-15024.5 - Canadian Pacific Railway spiral tunnels in Yoho National Park, British Columbia in August 1989.
- ItemJMF23-15025.0 - Canadian Pacific Railway tunnel at , on July 17, 1990.
- ItemJMF23-15025.8 - Canadian Pacific Railway tunnel at Kicking Horse Pass, British Columbia on July 17, 1990.