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100   $a20040928d1971----km-y0itay0103----ba
101 0 $aeng
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200 1 $aNormative systems$fCarlos E. Alchourron and Eugenio Bulygin
210   $aWien [etc.]$cSpringer$d1971
215   $aXVIII, 208 p.$d24 cm.
225 2 $aLibrary of exact philosophy
410  0$12001$aLibrary of exact philosophy
454  1$12001
461  1$1001-------$12001
700  1$aALCHOURRON,$bCarlos E.$0348350
701  1$aBULYGIN,$bEugenio$054148
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