00277nam a2200097Ia 4500008004000000082001500040100002400055245003600079260004800115300001600163210210b1971   xxu||||| |||| 00| 0 eng d  a306.4 GURS  aGURVITCH (Georges).  aSocial frameworks of knowledge.  aNew York.bHarper & Row, Publishers.,c1971  axxxviii,292