Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1012 - Cartographic materials
- Subseries Level 2002 - Plats
- 1226 more...
- ItemPlat012775 - Plat Map of Northern Pacific Facilities at East Helena, Montana, 1941
- ItemPlat012776 - Plat Map of Northern Pacific Facilities at East Helena, Montana, 1941
- ItemPlat012777 - Plat Map of Northern Pacific Facilities at East Helena, Montana, 1916
- ItemPlat012778 - Plat Map of Northern Pacific Facilities at East Helena, Montana, 1916
- ItemPlat012779 - Plat Map of Northern Pacific Facilities at East Olympia, Washington, 1914
- ItemPlat012780 - Plat Map of Northern Pacific Facilities at East Olympia, Washington, 1914
- ItemPlat012781 - Plat Map of Northern Pacific Facilities at East Olympia, Washington, 1914
- ItemPlat012782 - Plat Map of Northern Pacific Facilities at East Olympia, Washington, 1914
- ItemPlat012783 - Plat Map of Northern Pacific Facilities at East Olympia, Washington, 1965
- 600 more...