Railroad Archives Online
- CollectionD0335.2 - Northern Pacific Railway Historical Association Depot Photograph Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3002 - Depots and Freighthouses
- 51 more...
- ItemNPDepot0052 - Northern Pacific Depot at Billings, Montana, undated
- ItemNPDepot0053 - Northern Pacific Depot at Billings, Montana, circa 1952
- ItemNPDepot0054 - Northern Pacific Depot at Billings, Montana, 1960s
- ItemNPDepot0055 - Northern Pacific Depot at Billings, Montana, 1996
- ItemNPDepot0056 - Northern Pacific Depot at Bismarck, North Dakota, 1876
- ItemNPDepot0057 - Northern Pacific Depot at Bismarck, North Dakota, 1883
- ItemNPDepot0058 - Northern Pacific Depot at Bismarck, North Dakota, circa 1910
- ItemNPDepot0059 - Northern Pacific Depot at Bismarck, North Dakota, 1902
- ItemNPDepot0060 - Northern Pacific Depot at Bismarck, North Dakota, 1969
- 601 more...