00271nam a2200121Ia 4500008004100000100001600041245002400057250000800081260002800089300000800117942000700125999001700132161022s9999    xx            000 0 und d  aHosmer G l   aPractical Astronomy  a4th  bJohnwilly Landon c1958  a355  cBK  c50204d50204