Railroad Archives Online
- CollectionE0477 - BNSF Maps, Drawings and Records Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1006 - Business Correspondence
- ItemEBP1311 - Great Northern Letter, Duluth, Minnesota, 1909
- ItemEBP1505 - Saint Paul, Minneapolis & Manitoba Railway Letter, Fergus Falls, Minnesota, 1884
- ItemEBP1594 - Great Northern Letter, Froid, Montana, 1910
- ItemEBP1623 - Great Northern Bridge Letter, undated
- ItemEBP1934 - Vancouver, Victoria and Eastern Railway Letter, Indian Reservation, British Columbia, undated
- 6 more...