3 1 50 Pemeliharaan Lingkungan Hidup Daerah Istimewa Yogyakarta Sumintarsih Additional Author Salamun Additional Author Suhartinah S. Additional Author Sulistyo Budi Additional Author Suwarno Additional Author Mudjiono Additional Author mixed material Yogyakarta Departemen Pendidikan dan Kebudayaan 1993 Sumintarsih Additional Author H.R.J. Siregar Additional Author Si Luh Swarsi Additional Author I. Wayan Geriya Additional Author I. Wayan Panca Additional Author S. Endra Kusuma Additional Author I. Ketut Barusna Additional Author mixed material Jakarta Departemen Pendidikan dan Kebudayaan 1991 Sumintarsih Additional Author wibowo Additional Author mixed material Yogyakarta Departemen Pendidikan dan Kebudayaan 1991