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*1001 $aBurt, Cyril$0(NO-TrBIB)90526082$_37601700
*24514$aThe causes and treatment of backwardness
*250  $a4th ed.
*260  $aLondon$bUniversity of London press$cc1957
*300  $a128 s.
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*999  $aoai:nb.bibsys.no:999325286784702202$b2021-11-14T20:17:52Z$z999325286784702202
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