00537nam a2200169Ia 4500003000900000008004100009040001600050080002200066245008900088260004100177300002300218650004100241650002000282650002300302700002200325700002000347IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a524.7(082.1)bOBS 0aObservational aspects of galactic structurec edited by A. Blaauw and L.N. Mavridis.  aAthensbNATO Science Committeec1965  a[various pagings.]  aAstronomy and astrophysics thesaurus  aGalactic nuclei  aGalactic structure  a Mavridis, L. N.  aBlaauw, A., ed.