00509nam a2200145Ia 4500003000900000008004100009040001600050080001500066110004000081245010400121260004600225300001000271650003900281650004300320IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a25.45bBRI  aU. K. British Standards Institution 0aGuide to the universal decimal classification (UDC) B S 1000 C 025.45cBritish Standard Institution  aLondonbW I British Standards Housec1963  a128p.  a Universal Decimal Classification  aAstronomy and Astrophysics Thesaurus