4 1 10 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 P.Purba Additional Author Adlin U.Lubis Additional Author Suheimi Syukur Additional Author A.H. Bakri Additional Author mixed material Pematang Siantar Pusat Penelitian Marihat 1982 COVER_NO.1_VOL.2.jpg Adlin U. Lubis Additional Author Endang Syamsuddin Additional Author A. Sipayung Additional Author Sudharto Ps Additional Author Suheimi Syukur Additional Author R. Sukarji Additional Author T.L. Tombing Additional Author mixed material 02161427 Upper Saddle River, NJ Pusat Penelitian Marihat 1985 COVER_VO.5_NO.2_AGUSTUS_1985.jpg Adlin U. Lubis Additional Author P. Purba Additional Author Fidber Chan Additional Author Sri Wahyuni Additional Author Suheimi Syukur Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1986 COVER_VOL.6_NO.1_APRIL_1986.jpg