00321nam a2200121Ia 450000500170000000800410001702000150005805000190007310000190009224500400011126000350015165000130018620251229190623.0251229s9999    xx            000 0 und d  a0316091960  aQB 45 .B4 1986  aBerman,  Louis 0aExploring the cosmosc Louis Berman  aBostonb Littlec Brown  1986.  aAtronomy