00338nam a2200097Ia 4500008004100000082001900041100001400060245009900074260005900173300000800232140113s9999    xx            000 0 und d  a543:001.8   L2  aAnonymous  a"Changes in official methods of analysis made at the 86th annual meeting, October 9- 12, 1972"  a1972bThe Association of Official ChemistscWashington  a447