- Umatilla County, Oregon (data.census.gov)
Umatilla County, Oregon has 3,215.4 square miles of land area and is the 8th largest county in Oregon by total area. Umatilla County, Oregon is bordered by Walla Walla County, Washington, Union County, Oregon, Columbia County, Washington, Wallowa County, Oregon, Morrow County, Oregon, Grant County, Oregon, and Benton County, Washington.
- Geology and coal resources of the Centralia-Chehalis district, Washington (pubs.usgs.gov)
The Centralia-Chehalis coal district includes about 570 square miles in south western Thurston County and northwestern Lewis County, Wash., midway between Seattle, Wash., and Portland, Oreg., and forms a part of the subbituminous and lignite coal fields of southwestern Washington. It adjoins the Morton coal field on the east and the Toledo coal field on the south. It includes a part of the extreme western foothills of the Cascade Range and a part of the eastern border of the Coast Ranges.