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200 10$aBentonite deposits of the Yellowtail district, Montana and Wyoming /$fby M.M. Knechtel and S.H. Patterson
210  1$aWashington, D.C. :$cUnited States Department of the Interior, Geological Survey,$d1952.
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702   $aPatterson$b Sam H$g(Sam Hunting),$f1918-2004,
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300   $a"EPA-420-D-19-001."
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