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2. A Thin red line: pigments and paint technology of the Northwest Coast;Ancheta,2013
3. Ceramic Theory and Cultural Process;Arnold,1988
4. A review of the deposition and alteration of filled-sink deposits of east-central Missouri;Asher-Bolinder;USGS Open-File Report,1992
5. Geology of Plymouth County;Bain;Iowa Geological Survey Annual Report,1898