See R. Atkeson, Oregon Coast (1972); W. G. Loy et al., Atlas of Oregon (1976); W. A. Bowen, The Willamette Valley: Migration and Settlement on the Oregon Frontier (1978); S. and E. Dicken, Two Centuries of Oregon Geography (Vol. I, 1979; Vol. II, 1982) and Oregon Divided: A Regional Geography (1982).
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