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 3003 - Maintenance Facilities
- 850 more...
- ItemStruc007016 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- ItemStruc007017 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- ItemStruc007018 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- ItemStruc007019 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1956
- ItemStruc007072 - Northern Pacific Engineering Drawing, Store Department Relocations at Pasco, Washington, 1965
- ItemStruc007073 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- ItemStruc007074 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- ItemStruc007075 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- ItemStruc007076 - Northern Pacific Engineering Drawing, Unnamed Structure at Pasco, Washington, 1915
- 452 more...