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200 1 $a1990 Catalog$fSigma immuno chemicals.
210   $aSt. Louis$cSigma chemical company$dcopyr. 1989
215   $a228 p.$d28 cm
610 0 $aAziende chimiche$aCataloghi di vendita
676   $a338.476 61
710 02$aSIGMA IMMUNO CHEMICALS
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