00288nam a2200109Ia 4500008004100000040002500041082001200066100002200078245003000100260004000130300000800170230627s9999    xx            000 0 und d  aNORSU-SiacNORSU-Sia  a520 Se3  aSeeds, Michael A. 0aFoundations of astronomy   bWadsworth Publishing Company c1986  a596