Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3002 - Depots and Freighthouses
- 1167 more...
- ItemStruc007000 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1902
- ItemStruc007001 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1902
- ItemStruc007002 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1902
- ItemStruc007003 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1902
- ItemStruc007004 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, undated
- ItemStruc007005 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, undated
- ItemStruc007006 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1902
- ItemStruc007007 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1970
- ItemStruc007008 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1964
- 486 more...