Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Série004 - Northern Pacific Railroad Company
- Sous-série009 - Engineering Records
- 008 - Physical plant drawing
- 003 - Maintenance Facilities
- 852 en plus...
- PièceStruc007018 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- PièceStruc007019 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1956
- PièceStruc007072 - Northern Pacific Engineering Drawing, Store Department Relocations at Pasco, Washington, 1965
- PièceStruc007073 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- PièceStruc007074 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- PièceStruc007075 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- PièceStruc007076 - Northern Pacific Engineering Drawing, Unnamed Structure at Pasco, Washington, 1915
- PièceStruc007077 - Northern Pacific Engineering Drawing, Unnamed Structure at Pasco, Washington, 1915
- PièceStruc007078 - Northern Pacific Engineering Drawing, Store House at Pasco, Washington, 1922
- 450 en plus...