Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series008 - Union Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3013 - Railroad Accidents
- ItemJMF17-12747.0 - Union Pacific accident at Pioneer Pit, Washington in 1972.
- ItemJMF17-12747.2 - Union Pacific accident at Pioneer Pit, Washington in 1972.
- ItemJMF17-12748.0 - Union Pacific accident at Pioneer Pit, Washington in 1972.
- ItemJMF17-12748.1 - Union Pacific accident at Pioneer Pit, Washington in 1972.
- ItemJMF17-12748.2 - Union Pacific accident at Pioneer Pit, Washington in 1972.
- 7 more...