000			00343nam a22001457a 4500
050			_aMED QL955 _bE2
100			_aElbert, J.D
245			_aInteracting systems in development
250			_a2nd ed.
260			_aNew York _bHolt, Rinehart _c1970
300			_ax, 338p. _bill.
650			_aDevelopment
700			_aSussex, Ian M
942			_cBK
999			_c14567 _d14567