8 1 10 P.Purba ,A.U.Lubis Primary Author mixed material Marihat Ulu, Pematang Siantar 1985 PT.PERKEBUNAN_VI-VII.JPG.JPG Ir. Ch.Hutauruk Additional Author Ir. A.U.Lubis Additional Author Ir. E.L.Tobing Additional Author Ir. H. S. Situmorang Additional Author R. P. Manurung Additional Author mixed material Pematang Siantar Pusat Penelitian Marihat 1983 IMG_20190218_0001_.jpg Ir. Ch.Hutauruk Additional Author Ir. A.U.Lubis Additional Author Ir. E.L.Tobing Additional Author R. P. Manurung Additional Author Ir.H.S. Situmorang Additional Author mixed material Pematang Siantar Pusat Penelitian Marihat 1983 1_.jpeg Daswir Additional Author LALANG BUANA Additional Author Dwi Asmono Additional Author DARNOKO Additional Author A. Razak Purba Additional Author Fatmawati Additional Author A.Sipayung Additional Author SOEMARTONO Additional Author Nasrullah Additional Author Tri Hutomo Additional Author Rachmat Adiwiganda Additional Author Zulkarnain Poeloengan Additional Author Akiyat Additional Author A.D. Koedadiri Additional Author A.U. Lubis Additional Author P.Purba Additional Author R.A.Lubis Additional Author Alex Hartana Additional Author Edi Guhardja Additional Author Sudirman Yahya Additional Author L.A. Napitupulu Additional Author G.Ginting Additional Author J.Brahmana Additional Author Iswandi Anas Additional Author mixed material Medan Pusat Penelitian Kelapa Sawit 1993 IMG_20190201_0001.jpg Endang Syamsuddin Additional Author Sudharto Ps Additional Author Suwandi Additional Author R. Desmier De Chenon Additional Author A.U. Lubis Additional Author B. Naert Additional Author R. Gal Additional Author J. Olivin Additional Author Desmier de Chenon Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1990 COVER_VO.10_NO.1_APRIL_1990.jpg Endang Syamsuddin Additional Author A. Sipayung Additional Author T.L. Tobing Additional Author Sudharto Ps Additional Author Suwandi Additional Author A.U. Lubis Additional Author B. Naert Additional Author R. Gal Additional Author J. Olivin Additional Author Desmier de Chenon Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1990 COVER_VO.10_NO.1_APRIL_1990.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 Endang Syamsuddin Additional Author R.A. Lubis Additional Author Fidber Chan Additional Author Sudharto Ps Additional Author Suwandi Additional Author A.U. Lubis Additional Author Ch. Hutauruk Additional Author R. Sukarji Additional Author Herman Halim Additional Author Kusnu M Additional Author Y.R. Lubis Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1984 COVER_VOL.4_NO.1_APRIL_1984.jpg