Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3002 - Depots/Freighthouses
- ItemJMF04-02307.0 - Northern Pacific Union Station drawing at Tacoma, Washington, circa 1910.
- ItemJMF04-02308.0 - Northern Pacific Union Station drawing at Tacoma, Washington, circa 1910.
- ItemJMF04-02309.0 - Northern Pacific Union Station drawing at Tacoma, Washington, circa 1910.
- ItemJMF04-02310.0 - Northern Pacific Union Station drawing at Tacoma, Washington, circa 1910.