00591nam0-22002291i-450-990001305080403321000130508FED01000130508(Aleph)000130508FED0100013050820000920d--------km-y0itay50------baengObstruction theoryby SPANIER E.H.Spanier,Edwin H.41913ITUNINARICAUNIMARCBK99000130508040332122-A-27NO INVENTARIOMA1MA1Obstruction theory383210UNINAING01