
The Tualatin River valley and the Chehalem Mountains form the backbone of this wartime survey, showing a landscape defined by timber extraction and agriculture during the early 1940s. The Stimson Lumber Company Railroad winds into the northwestern hills to reach the Stimson Lumber Camp, illustrating the era's heavy industrial reliance on rail for forest operations. Further south, the Southern Pacific line connects established agricultural centers like Yamhill, Carlton, and Gaston.
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