Maps. Oregon. Geology of northwestern Oregon, west of Willamette River and north of latitude 45° 15′, geology by W. C. Warren, R. M. Grivetti, and Hans Norbisrath (geology of Portland area after R. C. Treasher, geology of St. Helens quadrangle adapted from manuscript map of Oregon State Department of Geology and Mineral Industries); oil and gas investigations, preliminary map 42 [with text] by W. C. Warren. Hans Norbisrath and R. M. Grivetti. Scale 7 in. =3.1 in., contour interval 300 ft. n. p.

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