title: In praise of PIDs.
authors.affiliation: RAE Systems of Sunnyvale, Calif., USA. RaeSales@raesystems.com
authors.forename: C
authors.initials: C
authors.lastname: Wrenn
mesh_terms: D002617:Chemical Industry; D004784:Environmental Monitoring / Q000295:instrumentation*; D006801:Humans; D016272:Occupational Health; D009930:Organic Chemicals
chemical_list: D009930:Organic Chemicals