Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3005 - Maintenance of Way cars
- 67 more...
- ItemJMF17-12824.0 - Northern Pacific rotary snow plow number 42 at Stampede, Washington in 1972.
- ItemJMF17-12825.0 - Northern Pacific rotary snow plow number 42 at Stampede, Washington in 1972.
- ItemJMF17-12827.0 - Northern Pacific rotary snow plow number 42 at Stampede, Washington in 1972.
- ItemJMF17-12828.0 - Northern Pacific rotary snow plow number 42 at Stampede, Washington in 1972.
- ItemJMF17-12829.0 - Northern Pacific rotary snow plow number 42 at Stampede, Washington in 1972.