Northern Pacific Engineering Drawing: General Plan/Stringers Diagram, Bridge 18 - Austin Gulch, west of Skyline, Montana, Line Segment 042, Milepost 18.9. Sheet 1067 - 9, 1926. Note: Steel viaduct
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Taken From: "List of Officers, Agents, Stations, Etc. Number 44" published by the NP Accounting Department.