Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1012 - Cartographic materials
- Subseries Level 2002 - Plats
- 1060 more...
- ItemPlat012530 - Plat Map of Great Northern Facilities at Helena, Montana, 1915
- ItemPlat012531 - Plat Map of Great Northern Facilities at Helena, Montana, 1930
- ItemPlat012532 - Plat Map of Great Northern Facilities at Helena, Montana, 1930
- ItemPlat012533 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- ItemPlat012534 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- ItemPlat012535 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- ItemPlat012536 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- ItemPlat012537 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- ItemPlat012538 - Plat Map of Great Northern Facilities at Helena, Montana, 1960
- 685 more...