Railroad Archives Online
- CollectionD0335.2 - Northern Pacific Railway Historical Association Depot Photograph Collection
- Seriesex: 001 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3002 - Depots and Freighthouses
- ItemNPDepot0001 - The Northern Pacific Depot at Aberdeen, Washington, circa 1915
- ItemNPDepot0002 - The Northern Pacific Depot at Adrian, North Dakota, 1968
- ItemNPDepot0003 - The Northern Pacific Depot at Aitkin, Minnesota, undated
- ItemNPDepot0004 - The Northern Pacific Depot at Aitkin, Minnesota, undated
- ItemNPDepot0005 - The Northern Pacific Depot at Almira, Washington, 1940s
- 656 more...