000			00390nam a2200157Ia 4500
001			9734
008			170722s9999 xx 000 0 und d
100			_aVickery, B. C.
245			_aOn retrieval system theory /
250			_a2nd ed.
260			_aButterworths : _bLondon , _c1965.
300			_axii+191 _c21.5cms
653			_aDocumentation
653			_aLibrary Science
942			_cGEN
999			_c160551 _d160551