Report copyright - Preece test (copper-sulphate dip) for zinc coatingsnvlpubs.nist.gov/nistpubs/jres/12/jresv12n6p785_A2b.pdfPREECETEST(COPPER-SULPHATEDIP)FORZINC COATINGS E.C.GroesbeckandH.H.Walkup
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