Northern Pacific Engineering Drawing: Detail of Abutment, Bridge 21 - Irrigation Canal, west of Laurel, Montana, Line Segment 041, Milepost 21.9. Sheet 1056 - 17, 1917. Note: Concrete slab

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.