000			00335nam a2200157Ia 4500
008			170207s9999 xx 000 0 und d
020			_a9788131504659
082			_a510 CRO-P
100			_aCroon
245			_aPrinciples of Topology
260			_bIE
300			_a312
365			_b250
650			_aMathematics
942			_cBOOKS
999			_c49316 _d49316