Northern Pacific Engineering Drawing: Viaduct Reinforcement Girder, Bridge 18 - Austin Gulch, west of Skyline, Montana, Line Segment 042, Milepost 18.9. Sheet 1067 - 9, undated.

Northern Pacific Engineering Drawing: Viaduct Reinforcement Girder, Bridge 18 - Austin Gulch, west of Skyline, Montana, Line Segment 042, Milepost 18.9. Sheet 1067 - 9, undated.

Northern Pacific Engineering Drawing: Vertical Slide Door, Bozeman Tunnel, Muir, Montana, Line Segment 041, Milepost 127.5. Sheet 1268 - 14, undated.

Northern Pacific Engineering Drawing: Vertical Section Borings, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0, undated.

Northern Pacific Engineering Drawing: Vertical Post Bar, etc., Bridge 1 - Columbia River, west of Pasco, Washington, Line Segment 048, Milepost 1.32. Sheet 770 - 1, undated.

Northern Pacific Engineering Drawing: Ventilation Motor Rooms, Mullan Tunnel, Blossburg, Montana, Line Segment 042, Milepost 19.6. Sheet 282 - 46, undated.

Northern Pacific Engineering Drawing: Ventilating Plant, Mullan Tunnel, Blossburg, Montana, Line Segment 042, Milepost 19.6, undated.