Northern Pacific Engineering Drawing: Tie Plan, Bridge 1 - Skookumchuck River, west of Centralia, Washington, Line Segment 421, Milepost 1.7. Sheet 1058 - 41, 1949.

Northern Pacific Engineering Drawing: Shop Plan - Pile Caps, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Shop Plan - Miscellaneous, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Shop Plan - Erection Plan, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Rebuild Bridge, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Proposed for Rebuilding, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Proposed for Rebuilding, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.

Northern Pacific Engineering Drawing: Proposed for Rebuilding, Bridge 55 - Saslzer Creek, south of Centralia, Washington, Line Segment 052, Milepost 55.9. Sheet 2009 - 3, undated.