residue levels of the chlorinated hydrocarbons hexachlorobenzene ( hcb ) , polychlorinated biphenyls ( pcbs ) , alpha- , beta- , and gamma-hexachlorocyclohexane ( hch ) , oxychlordane , trans-nonachlor , aldrin , and dieldrin in adult puffins ( fratercula arctica ) from two colonies in norway ( rost 67 degrees 30 ' n and hornoy 70 degrees 20 ' n ) showing differences in breeding performance were compared in 1982 .
C0020247
chlorinated hydrocarbons
C0005038
gamma-hexachlorocyclohexane