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
- 5 more...
- ItemStruc004936 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1913
- ItemStruc004937 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1914
- ItemStruc004938 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1890
- ItemStruc004939 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1913
- ItemStruc004940 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, undated
- ItemStruc004941 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1913
- ItemStruc004942 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1913
- ItemStruc004943 - Northern Pacific Engineering Drawing, Subway Under 7th Streetat Olympia, Washington, 1911
- ItemBB014541 - Northern Pacific Engineering Drawing: 8 Inch Beam Rib Section, Garrison Tunnel, West of Garrison, Montana, undated
- 115 more...