00337nam a2200157Ia 4500008004100000020000900041035001000050082001500060100002100075245002500096250000900121260002700130300000800157500000800165650000600173210723s9999||||xx |||||||||||||| ||und||  aNULL  a24043  a542.9BSAN  aSanderson, R. T. 0aChemical Periodicity  a2 nd  aNew YorkbVan Nostrand  a330  a474  a-