Great Northern Railway Historical Society Blueprint Collection JSBP9059, Whitmarsh, Washington, 1950. Great Northern Blueprint Number 313-2312-91, Bridge #12 over Swinomish Slough. General Plan of Machinery - With Parts Diagrams. Authorization for Expenditure 80374. 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.