Historical patterns in mercury exposure for North American songbirds. - Perkins, Marie; Lane, Oksana P.; Evers, David C.; Sauer, Amy; Adams, Evan M.; O'Driscoll, Nelson J.; Edmunds, Samuel T.; Jackson, Allyson K.; Hagelin, Julie C.; Trimble, Jeremiah; Sunderland, Elsie M. (Ecotoxicology, 2020)