00380nam a2200157Ia 4500003000900000008004100009040001600050080001300066100001800079245004400097260002700141300001000168650001300178650001400191650001700205IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a521bROB  aRobertson, J. 4aThe elements of astronomycJ. Robertson  aLondonbJ Noursec1950  a390p.  aArchives  aAstronomy  aAstrophysics