KAJIAN SPASIAL KUALITAS AIR TANAH BEBAS BERDASARKAN KEDALAM MUKA AIR TANAH: STUDI KASUS DI DATARAN ALUVIAL DAS PEMALI KABUPATEN BREBES (Spatial Study of the Quality of Free Groundwater Based on the Surface Depth of Groundwater at an Alluvial Land) - Miswadi, Siti Sundari (Pusat Studi Lingkungan Hidup Universitas Gadjah Mada, 2009)