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Older values of the constants Archive of older articles and tables of values The 1973 set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) are provided for historical reference below: Detailed description of the 1973 adjustment, including the covariance matrix of selected constants: E. R. Cohen and B. N. Taylor, J. Phys. Chem. Ref. Data 2(4) 663-734 (1973)    Return to Background information related to the constants.