HUBUNGAN KEPADATAN, JENIS KENDARAAN TERHADAP KADAR TIMBAL UDARA DAN URIN MASYARAKAT SEKITAR JALAN RAYA KOTA YOGYAKARTA (The Relathionship between congestion, type of vehicle with the lead air content and lead urine content of the people around the street) - Irwansyah, T. (Pusat Studi Lingkungan Hidup Universitas Gadjah Mada, 2003)