000			00621nam a2200205Ia 4500
008			220516s9999 xx 000 0 und d
020			_a0208016600
041			_aeng
082			_a025.302854 _bHOU/O
100			_aHoughton, Bernard.
245		0	_aOn-line information retrieval systems _b: An introductory manual to principles and practice _c / by Bernard Houghton and John Convey
260			_aLondon: _bClive Bingley , _c1977.
300			_a160p.
650			_aBoolean logic
650			_aInformation retrieval
650			_aLibrary science
650			_aOn-line access
700			_aConvey, John.
942			_cBK
999			_c2122 _d2122