00297nam a22001337a 4500003000400000020001800004082001800022100002100040245004100061250000800102260002600110300000800136650001900144SGT  a9781550091847  a617.632bC03H  aHall, Walter B.   aClinical decisions in Periodontology  a4th  bB C Decker Inc.c2003  a324  aPeriodontology