00310nam a2200097Ia 4500008004100000082002800041100003300069245005600102260004600158300000800204140113s9999    xx            000 0 und d  a574:6:546.16:551.5   L1  aNational Academy of Sciences  aFlorides-Biologic effects of atmospheric pollutants  a1971bNational Academy of SciencecU.S.A.  a295