Railroad Archives Online
- 宗卷D0027 - Timothy Miller Collection
- 系列004 - Northern Pacific Railroad Company
- 次系列009 - Engineering Records
- 008 - Physical plant drawing
- 003 - Maintenance Facilities
- 840 more...
- 物件Struc006977 - Northern Pacific Engineering Drawing, at Helena, Montana, undated
- 物件Struc006978 - Northern Pacific Engineering Drawing, at Helena, Montana, undated
- 物件Struc006979 - Northern Pacific Engineering Drawing, at Helena, Montana, undated
- 物件Struc006980 - Northern Pacific Engineering Drawing, at Helena, Montana, undated
- 物件Struc006986 - Northern Pacific Engineering Drawing, at Helena, Montana, 1968
- 物件Struc007010 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1963
- 物件Struc007012 - Northern Pacific Engineering Drawing, Unnamed Structure at Helena, Montana, 1963
- 物件Struc007013 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1960
- 物件Struc007014 - Northern Pacific Engineering Drawing, Roundhouse at Helena, Montana, 1961
- 462 more...