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102   $aIT
200 1 $aProduction Systems and Hierarchies of Centres$eThe Relationship Between Spatial and Economic Structures$fJan Gunnarsson.
210   $aLeiden$cMartinus Nijhoff$d1977.
215   $aviii, 140 p.$d22 cm
225 1 $aStudies in applied regional science$v7
610 0 $aSpazio$aAspetti economici
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702  1$aGunnarsson,$bJan
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