00450     2200169   4500001002100000005001500021035002500036008004100061082001200102090000800114100003000122245002300152260005000175650000900225084001600234300003000250INLIS00000000000285420240622092128  a0010-061600000002853240622                           0 eng    a616.979  aWor  aWorld Health Organization1 aAIDS The Challenge  aNew York :bWorld Health Organization,c1999.  aAIDS  a616.979 Wor  a28 hlm, :bilus ;c21 cm.