Northern Pacific Engineering Drawing: Sketch and Bill of Material, Bridge 114.8 - I-5 Dike Road, south of Kalama, Washington, Line Segment 052, Milepost 114.8. Sheet 347 - 6585 - 13, undated.

Northern Pacific Engineering Drawing: Single Truss/Center Bearing Span, Bridge 38 - Snohomish River, south of Snohomish, Washington, Line Segment 403, Milepost 38.0. Sheet 778 - 2, undated.

Northern Pacific Engineering Drawing: Single Truss Through Pin, Bridge 104 - Nooksack River, north of Acme, Washington, Line Segment 403, Milepost 104.3. Sheet 771 - 25, undated.

Northern Pacific Engineering Drawing: Simplified Control Schematic, Bridge 14 - Chambers Creek, south of Titlow, Washington, Line Segment 052, Milepost 14.2. Sheet 2011 - 1, undated.

Northern Pacific Engineering Drawing: Signal Bridges D and E, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.

Northern Pacific Engineering Drawing: Signal Bridges D and E, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.

Northern Pacific Engineering Drawing: Signal Bridge G, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.

Northern Pacific Engineering Drawing: Signal Bridge G, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.

Northern Pacific Engineering Drawing: Signal Bridge F, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.

Northern Pacific Engineering Drawing: Signal Bridge E, Bridge 0.2 - 4th Avenue Viaduct, Seattle, Washington, Line Segment 051. Sheet 196 - 2387, undated.