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
- 1174 more...
- ItemStruc007007 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1970
- ItemStruc007008 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1964
- ItemStruc007009 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1956
- ItemStruc007011 - Northern Pacific Engineering Drawing, Depot at Helena, Montana, 1960
- ItemStruc007020 - Northern Pacific Engineering Drawing, Depot at Pasco, Washington, 1960
- ItemStruc007021 - Northern Pacific Engineering Drawing, Depot at Pasco, Washington, 1961
- ItemStruc007022 - Northern Pacific Engineering Drawing, Depot at Pasco, Washington, 1965
- ItemStruc007023 - Northern Pacific Engineering Drawing, Depot at Pasco, Washington, 1967
- ItemStruc007024 - Northern Pacific Engineering Drawing, Depot at Pasco, Washington, 1967
- 479 more...