00385nam a2200097Ia 4500008004100000050002000041100002100061245005100082247007100133264008300204230508s1987    xx            000 0 und d  aQB 45 A139 19871 aAbell, George D.10aExploration of the universe.cAbell, George D.  aExploration of the universe._QB 45 A139 1987_Abell, George D._1987  a[Place of publication not identified] : bSaunders College Publishing, c1987.