Washington State Highway Department: Bridges 1920 to 1931, Special Collections, Linderman Library, Lehigh University, Bethlehem, PA
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Washington State Highway Department: Bridges 1920 to 1931, Special Collections, Linderman Library, Lehigh University, Bethlehem, PA https://archivesspace.lib.lehigh.edu//repositories/3/resources/170 Accessed April 19, 2025.