Railroad Archives Online
- FondoD0027 - Timothy Miller Collection
- Serie004 - Northern Pacific Railroad Company
- Sottoserie009 - Engineering Records
- 008 - Physical plant drawing
- 004 - Maintenance of Way support
- Unità documentariaStruc001181 - Northern Pacific Engineering Drawing, Section House at Saint Anthony, North Dakota, 1970
- Unità documentariaStruc001187 - Northern Pacific Engineering Drawing, Rail Welding Plant Building at Laurel, Montana, 1971
- Unità documentariaStruc001322 - Northern Pacific Engineering Drawing, Rail Welding Plant Building at Laurel, Montana, 1970
- Unità documentariaStruc001323 - Northern Pacific Engineering Drawing, Rail Welding Plant Building at Laurel, Montana, 1970
- Unità documentariaStruc002496 - Northern Pacific Engineering Drawing, Section Tool House at Pe Ell, Washington, 1969
- 198 in più...