Classifications and correspondence tables

�        Soviet Classification of 1965

�        Soviet Classification of 1970

�        Soviet Classification of 1981 including a correspondence with the 9^th revision of the International Classification of Diseases (ICD)

�        Fundamental associations of items between 1970 and 1965 classifications

�        Fundamental associations of items between 1981 and 1970 classifications

�        Fundamental associations of items between 1988 and 1981 classifications

�        Transition coefficients between 1965 and 1970 classifications

�        Transition coefficients between 1970 and 1981 classifications

�        Transition coefficients between 1981 and 1988 classifications

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