TY - RPRT TI - Organochlorine residues and shell thickness in eggs of the clapper rail, common gallinule, purple gallinule, and limpkin (Class Aves), eastern and southern United States, 1972-74 AU - Erwin E. Klaas AU - H. M. Ohlendorf AU - E. Cromartie PY - 1980 UR - https://pubs.usgs.gov/publication/5221586 ID - 5221586 ER -