000			00397 a2200157 4500
020			_a0914894137
082			_a001.64 _bULL
090			_c5624 _d7593
100			_aUllman, Jeffrey D.
245			_aPrinciples of database systems
260			_aPotomac _bComputer science press _c1980 _g1980
300			_a[vi], 379p. _c23cm.
650			_aCOMPUTER SCIENCE
650			_aDATA PROCESSING
942			_cL
999			_c34486 _d34486