2 1 10 Adlin U. Lubis Additional Author Iman Yani Harahap Additional Author TEGUH WAHYONO Additional Author Endang Syamsuddin Additional Author M. Lukman Fadli Additional Author A. Sipayung Additional Author P. Purba Additional Author T.L. Tobing Additional Author R.A. Lubis Additional Author R. Desmier de Chanon Additional Author Soedharto Ps Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1992 COVER_VOL.12_NO.2_JUNI_1992.jpg Ir. Ch.Hutauruk Additional Author Ir. A.U.Lubis Additional Author Ir. E.L.Tobing Additional Author Ir. A.Sipayung Additional Author Ir. Soedharto Ps. Additional Author Ir. Suheimi Syukur Additional Author Ir. P.Purba Additional Author mixed material Pematang Siantar Pusat Penelitian Marihat 1982 COVER_VOL.3_No.2.jpg