Railroad Archives Online
- FondD0027 - Timothy Miller Collection
- Sorozat004 - Northern Pacific Railroad Company
- Alsorozat009 - Engineering Records
- 008 - Physical plant drawing
- 001 - Bridges
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- IratdarabBB029299 - Northern Pacific Engineering Drawing: Shop Plan - Bill of Material, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029300 - Northern Pacific Engineering Drawing: Shop Plan - Bill of Material, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029301 - Northern Pacific Engineering Drawing: Shop Plan - Bill of Material, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029302 - Northern Pacific Engineering Drawing: Shop Plan - Bill of Material, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029303 - Northern Pacific Engineering Drawing: Shop Plan - General Plan, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029304 - Northern Pacific Engineering Drawing: Shop Plan - Floor Beams, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029305 - Northern Pacific Engineering Drawing: Shop Plan - Stringer/Brackets, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029306 - Northern Pacific Engineering Drawing: Shop Plan - Lateral/Stringer, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
- IratdarabBB029307 - Northern Pacific Engineering Drawing: Shop Plan - Top Chord, Bridge 207 - Clark Fork River, West of Donlan, Montana, undated
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