TY - RPRT TI - Embryotoxic effects of benzo[a]pyrene, chrysene and 7,12-dimethylbenz[a]-anthracene in petroleum hydrocarbon mixtures in mallard ducks AU - D. J. Hoffman AU - M. L. Gay PY - 2009 DO - 10.1080/15287398109530019 UR - https://pubs.usgs.gov/publication/5221677 ID - 5221677 ER -