8 1 10 A. Sipayung Additional Author P. Purba Additional Author T.L. Tobing Additional Author Kusnu Martoyo Additional Author Suwandi Additional Author Kiki Siregar Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1992 COVER_VOL.12_NO.1_PEBRUARI_1992.jpg Adlin U. Lubis Additional Author Suwandi Additional Author Kiki Siregar Additional Author Sri Wahyuni Additional Author Ridwan A. Lubis Additional Author S. Situmorang Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1991 COVER_VOL.11_NO.1_PEBRUARI_1991.jpg M. Lukman Fadli Additional Author P. Purba Additional Author Kiki Siregar Additional Author H. Suwandi Additional Author Okky S. Dharmaputra dan Widya Puspa Additional Author H. Adlin U. Lubis Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1991 COVER_VOL.11_NO.1_PEBRUARI_1991.jpg Adlin U. Lubis Additional Author Suwandi Additional Author Kiki Siregar Additional Author Sri Wahyuni Additional Author Ridwan A. Lubis Additional Author Situmorang Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1991 COVER_VOL._11_NO.2_APRIL_1991.jpg Ir. H. Adlin U. Lubis Additional Author Ir. Fidber Chan Additional Author Ir. E. Manalu Additional Author Ir. Kiki Siregar Additional Author Ir. P. Purba Additional Author Ir. H.S. Situmorang Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1987 A. Sipayung Additional Author P. Purba Additional Author T.L. Tobing Additional Author Kiki Siregar Additional Author A.R. Purba Additional Author R. Sukarji Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1988 COVER_VOL.8_NO.1_APRIL_1988.jpg P. Purba Additional Author T.L. Tobing Additional Author Kusnu Martoyo Additional Author Suwandi Additional Author Kiki Siregar Additional Author A.Sipayung Additional Author R.M. King Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Perkebunan Marihat 1992 Lubis, H. Adlin U; Kiki Siregar Additional Author mixed material Marihat Ulu Puslitbun Marihat 1991