00877nam--2200313---450-99000326429020331620090605121350.0000326429USA01000326429(ALEPH)000326429USA0100032642920090605d1976----km-y0itay50------baengUSa---||||001yyBlack holes, quasars & the universeHarry L. ShipmanBostonHoughton Mifflin Co.copyr. 1976VIII, 309 p.ill.24 cmAstronomia523SHIPMAN,Harry L.531189ITsalbcISBD990003264290203316523 SHI2850/CBS52300221680BKSCIRSIAV69020090605USA011213Black holes, quasars & the universe1118904UNISA