Northern Pacific Engineering Drawing: Walk Details, Bridge 41 (63), west of Avon, Montana, Line Segment 042, Milepost 41.6. Sheet 441 - 40, undated.

Northern Pacific Engineering Drawing: Tie Plan, Bridge 38 - Little Blackfoot Creek, west of Avon, Montana, Line Segment 042, Milepost 38.4. Sheet 441 - 52, undated.

Northern Pacific Engineering Drawing: Repair to west Abutment, Bridge 41 (63), west of Avon, Montana, Line Segment 042, Milepost 41.6. Sheet 441 - 40, undated.

Northern Pacific Engineering Drawing: Proposed Repair Pier/Abutment, Bridge 42 (65), west of Avon, Montana, Line Segment 042, Milepost 42.8. Sheet 441 - 39, undated.

Northern Pacific Engineering Drawing: Proposed Footwalk, Bridge 37 - Little Blackfoot Creek, Avon, Montana, Line Segment 042, Milepost 37.0. Sheet 441 - 52, undated.