00427nam a2200145Ia 4500008004100000020001500041082001700056100001900073245004300092260005000135300000800185650001600193650003700209653003500246170901s1974    xx            000 0 und d  a0706903021  a025.52bK98C  aKumar, Suseela 0aChanging Concepts of Reference Service  aDelhibVikas Publishing House Pvt. Ltd.c1974  a327  aGneralities  aLibrary and Information sciences  aReference services (Libraries)