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Caption: "Union Pacific Bridge -- Portland, OR.," c. 1915. Built in 1912, this through-truss, double-decker vertical lift bridge crosses the Willamette River in Portland, Oregon. See also 96-07-08-alb05-182.
Date: 1915
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Caption: "Boulder Dam - Arrow Points to Largest Tramway Derrick Ever Built," c. 1935.
Date: 1935