00325pab a2200121 454500008004000000100002400040245006300064260000900127300001000136362001000146650001900156773002800175180718b1988   xxu||||| |||| 00| 0 eng d  aMac Man Us, Susan A  aThe missing elementbAn examination of anlytic time frames  c1988  a39-45  aSept.  aUrban Research  aUrban Affairs Quarterly