TY - CONF A1 - von, S T1 - Development of contingent valuation surveys to value noncancer developmental and ecological effects of PCBs. Y1 - 2003/12/ N1 - R830821 ER - TY - CONF A1 - von, S T1 - Development of contingent valuation survey for ecological receptor and noncancer exposure to PCBs. Y1 - 2003/11/ N1 - R830821 ER -