00329nam a2200133Ia 4500008004100000020001800041082001600059100002000075245005200095260001700147261000900164300000800173650001400181171211s9999    xx            000 0 und d  a9780553406634  a523.1 STE/B  aStephen Hawking  aBlack holes and baby universes and other essays  bBantam books  c1993  a172  aAstronomy