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200 10$aLaboratory concentration of various Alaska copper ores /$fby R.R. Wells
210  1$a[Washington, D.C.] :$cUnited States Department of the Interior, Bureau of Mines,$d1956.
215   $a1 online resource (ii, 9 pages) $cmap
225 1 $aReport of investigations ;$v5245
300   $a"June 1956."
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