00258nam a2200097Ia 4500008004100000082001500041100001400056245003900070260004300109300000800152190709s9999    xx            000 0 und d  a523.01H998  aHynek.J.A 0aAstrophysics ; A topical symposium  aLondonbMcgraw-Hill Book Comopanc1951  a703