Counting the chemicals.
Marris
Emma
E
D002617:Chemical Industry; D004864:Equipment and Supplies; D007287:Inorganic Chemicals; D007753:Laboratories / Q000331:legislation & jurisprudence*; D012042:Registries; D012106:Research / Q000295:instrumentation*; D023481:Terrorism / Q000517:prevention & control; D014481:United States; D037041:United States Government Agencies; D014495:Universities / Q000331:legislation & jurisprudence
D007287:Inorganic Chemicals