00326nam a2200157Ia 4500008004100000020000900041035001000050082001600060100001500076245002000091250000600111260002900117300000800146500000800154650000600162210723s9999||||xx |||||||||||||| ||und||  aNULL  a25140  a546.75BCLA  aClassen, H 4aThe Nobel Gases  a-  a-bD. C. Heath & Company  a117  a438  a-