00269nam a2200109Ia 4500008004100000082001600041100002000057245002400077260003000101300001000131650001800141150301s1991    xx            000 0 und d  a617.6bE91C  aCROLL, THEODORE  aENAMEL MICROBRASION  bQUITESSENCE PUBaUKc1991  a1-102  aORAL MEDICINE