8/01  Misprint in problem F28:57.  The correct
      figure for this problem is Figure 26.23
      on page 898.  I apologize for any confusion
      caused by this misprint.  GBA

7/23  The key to Test 2 is now available at the 
      Copy Center in the ASU Computer Commons.

7/15  The key to Test 1 is now available at the 
      Copy Center in the ASU Computer Commons.