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 3008 - Tunnels
- 13 more...
- ItemBB014541 - Northern Pacific Engineering Drawing: 8 Inch Beam Rib Section, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB014542 - Northern Pacific Engineering Drawing: 8 Inch Beam Rib Section, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB014543 - Northern Pacific Engineering Drawing: Cross Sections, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB014544 - Northern Pacific Engineering Drawing: Cross Sections, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB015330 - Northern Pacific Engineering Drawing: Tunnel Sections, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB015331 - Northern Pacific Engineering Drawing: Repair to Tunnel, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB015332 - Northern Pacific Engineering Drawing: Forms for Tunnel, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB015333 - Northern Pacific Engineering Drawing: Sketch of New Lining, Garrison Tunnel, West of Garrison, Montana, undated
- ItemBB015334 - Northern Pacific Engineering Drawing: Sketch of New Lining, Garrison Tunnel, West of Garrison, Montana, undated
- 107 more...