Great Northern Railway Historical Society Blueprint Collection JSBP8561, Tonga, Washington, undated. Proposed Steel Repalcement Bridge Number 412. Elevation. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.
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Taken From: "GN Locations" database compiled by Jim Chinquist, year 1950.