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Book
Bowlsby, Clyde C., and Richard C. Swanson. Soil survey, Tillamook Area, Oregon In Soil Survey / United States. Soil Conservation Service . Vol. no.18. United States Soil Conservation Service. , 1964.
→ www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/oregon/TillamookOR_1964/TillamookOR_1964.pdf