Railroad Archives Online
- FondD0027 - Timothy Miller Collection
- Sorozat004 - Northern Pacific Railroad Company
- Alsorozat009 - Engineering Records
- 008 - Physical plant drawing
- 003 - Maintenance Facilities
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- IratdarabStruc007017 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- IratdarabStruc007018 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- IratdarabStruc007019 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1956
- IratdarabStruc007072 - Northern Pacific Engineering Drawing, Store Department Relocations at Pasco, Washington, 1965
- IratdarabStruc007073 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- IratdarabStruc007074 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- IratdarabStruc007075 - Northern Pacific Engineering Drawing, at Pasco, Washington, 1920
- IratdarabStruc007076 - Northern Pacific Engineering Drawing, Unnamed Structure at Pasco, Washington, 1915
- IratdarabStruc007077 - Northern Pacific Engineering Drawing, Unnamed Structure at Pasco, Washington, 1915
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