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 3002 - Depots and Freighthouses
- ItemStruc000027 - Northern Pacific Engineering Drawing, Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, 1969
- ItemStruc000028 - Northern Pacific Engineering Drawing, Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, 1969
- ItemStruc000029 - Northern Pacific Engineering Drawing, Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, 1969
- ItemStruc000030 - Northern Pacific Engineering Drawing, Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, 1969
- ItemStruc000031 - Northern Pacific Engineering Drawing, Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, 1969
- 1657 more...