00311nam a2200097Ia 4500008004100000082001900041100003300060245006700093260004600160300000700206140113s9999    xx            000 0 und d  a664:576.8   L1  aNational Academy of Sciences  aReference Methods for the microbiological Examination of foods  a1971bNational Academy of SciencecU.S.A.  a39