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Tualatin River Watershed
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Geology
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Seismic refraction method
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1. [Article] A seismic refraction study of a portion of the northeastern margin of the Tualatin Valley, Oregon
The Tualatin Valley is a well defined elliptical basin centered at Hillsboro, with a major axis trending roughly N65°W. The valley is bordered on the northeast by the Tualatin Mountains (Portland Hills) ...Citation