TY - Generic T1 - Workshop on critical limits and effects based approaches for heavy metals and persistent organic pollutants T2 - 3-7 November 1997 Y1 - 1998 A1 - UN ECE Convention on Long-range Transboundary Air Pollution A1 - Task Force on Mapping JF - 3-7 November 1997 PB - Federal Environment Agency (Umweltbundesamt), Berlin CY - Bad Harzburg, Germany ER -