00341nam a2200121Ia 450000500170000000800410001705000180005810000230007624500610009925000090016026000330016965000170020220251229085730.0251229s9999    xx            000 0 und d  aQD 33.C6 1976  aTimm, John  Arrend 0aChemistryban investigative approach.cJohn  Arrend Timm  arev.  aNew  YorkbMcGraw-Hillc1966  a1.Chemistry.