A method of coding chemicals for correlation and classification

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110 2 ‡aNational Research Council (U.S.) ‡bChemical-Biological Coordination Center.
245 0 2 ‡aA method of coding chemicals for correlation and classification.
260 ‡aWashington, ‡c1950.
300 ‡a98 p. ‡c28 cm.
538 ‡aMode of access: Internet.
650 0 ‡aPunched card systems.
650 0 ‡aChemistry ‡xClassification
CID ‡a001486399
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DAT 1 ‡a20130215111117.0 ‡b2019-10-18T18:05:28Z
DAT 2 ‡a2019-10-18T18:00:02Z
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