00350nam a2200157Ia 4500008004100000020000900041035001000050082001300060100001900073245003600092250000900128260003300137300000800170500000800178650000600186210723s9999||||xx |||||||||||||| ||und||  aNULL  a24109  a544BWEL  aWelcher, Frank 0aSemi Micro Qualitative Analysis  a1 st  aTorontobD. Van Nostrand Co.  a497  a133  a-