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Ramp, Len. Heavy Detrital Minerals of the South Umpqua River Drainage, Oregon. M.S. ed. Eugene, Or.: University of Oregon, 1953.
Ramp, Len. Geology & mineral resources of Douglas County, Oregon In Bulletin (Oregon. Dept. of Geology and Mineral Industries) . Portland, Or.: Oregon Dept. of Geology and Mineral Industries, 1972.
→ www.oregongeology.org/pubs/B/B-075.pdf