TY - RPRT TI - Reproductive outcomes in colonial fish-eating birds: A biomarker for developmental toxicants in Great Lakes food chains: II. Spatial variation in the occurrence and prevalence of bill defects in young double-crested cormorants in the Great Lakes, 1979–1987 AU - Glen Fox AU - Brian Collins AU - Ellen Hayakawa AU - D. V. Weseloh AU - James P. Ludwig AU - Timothy J. Kubiak AU - Thomas C. Erdman PY - 1991 DO - 10.1016/s0380-1330(91)71353-1 UR - https://pubs.usgs.gov/publication/70210051 ID - 70210051 ER -