00710nam a22002297a 450000500170000001000130001702000220003002000150005203500130006703700160008004000120009608200160010810000220012424501370014626000320028327000310031530000200034650000510036665000200041765000260043770000170046320170124105915.0  aA-057598  c00.00a0851572456  a0208016600  aA-057598  bCen Lib/Ret  aDPLbEN  a010.78bHOU  aHoughton, Bernard  aOn-line information retrieval systems :cby Bernard Houghton [and] John Convey ban introductory manual to principles and practice /  aLondonbClive Bingleyc1977  a16 Pembridge Road bLondon  a160p.c22cm(Hb)  aIncludes bibliographical references and  index  aLibrary Science  aInformation Retrieval  aConvey, John