TY - RPRT TI - Mercury and other element exposure to tree swallows (Tachycineta bicolor) nesting on Lostwood National Wildlife Refuge, North Dakota AU - T. W. Custer AU - Christine M. Custer AU - K. M. Johnson AU - D. J. Hoffman PY - 2008 DO - 10.1016/j.envpol.2007.12.003 UR - https://pubs.usgs.gov/publication/70000131 ID - 70000131 ER -