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Geology and ground water of the Tualatin Valley, Oregon
D. H. Hart, R. C. Newcomb
1965, Water Supply Paper 1697
The Tualatin Valley proper consists of broad valley plains, ranging in altitude from 100 to 300 feet, and the lower mountain slopes of the drainage basin of the Tualatin River, a tributary of the Willamette River in northwestern Oregon. The valley is almost entirely farmed. Its population is increasing rapidly,...