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200 1 $aRiddles in mathematics$ea books of paradoxes$fEugene P. Northrop
210   $aLondon$cPenguin Books$dc1944
215   $a239 p.$cill.$d18 cm
610 0 $aOpere di matematica generale
610 0 $aOpere di Bourbaki
700  1$aNorthrop,$bEugene P.$0127310
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