PCBs PCBs PCBs polychlorinated byphenyls long banned, especially PCBs, polychlorinated biphenyls PCBs (polychlorinated biphenyls) PCBs PCBS PCBs PCBs PCBS PCBs PCBs (polychlorinated biphenyls) PCBs PCBs http://oceanservice.noaa.gov/facts/pcbs.html PCBS http://oceanservice.noaa.gov/facts/pcbs.html PCBs polychlorinated biphenyls PCBS http://oceanservice.noaa.gov/facts/pcbs.html PCBs PCBs http://oceanservice.noaa.gov PCBS PCBs http://oceanservice.noaa.gov/facts/pcbs.html PCBs (polychlorinated biphenyls) polychlorinated biphenyls (PCBs) polychlorinated biphenyls PCBs electrical appliances