Northern Pacific Engineering Drawing: Rail Welding Plant Building at Laurel, Montana, prepared in 1970. Burlington Northern File Number 9787-E1, Reference Number 10111.

Northern Pacific Engineering Drawing: Rail Welding Plant Building at Laurel, Montana, prepared in 1970. Burlington Northern File Number 9787-M1, Reference Number 10110.

Northern Pacific Engineering Drawing: Rail Welding Plant Building Void at Laurel, Montana, prepared in 1971. Burlington Northern File Number 9787-E2, Reference Number 10104.