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100   $a20001010d1982----km-y0itay50------ba
101 0 $aita
105   $ay-------001yy
200 1 $aSocial research ethics$ean examination of the merits of covert participant observation$fedited by Martin Bulmer
205   $a1. ed.
210   $aLondon$cMacMillan$d1982
215   $axiv, 284 p.$d21 cm
610 0 $aScienze sociali$aRicerca$aAspetti etici
676   $a174.93
702  1$aBulmer,$bMartin
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