14 1 10 Kabul Pamin Additional Author Z. Poeloengan Additional Author Pusat Penelitian Kelapa Sawit (PPKS) Additional Author Purboyo Guritno Additional Author Eka Nuryanto Additional Author Endang Syamsuddin Additional Author Rolettha Y. Purba Additional Author Tjahjono Herawan Additional Author Rachmat Adiwiganda Additional Author Hasril Hasan Siregar Additional Author Angga Jatmika Additional Author Supriyadi Sadi Additional Author mixed material 08532141 Medan Pusat Penelitian Kelapa Sawit (PPKS) 1997 cover_warta_vol5no3.jpg Tanaman penutup tanah dan gulma pada kebun kelapa sawit. Buku II Witjaksana Darmosarkoro Primary Author Sudharto Prawirosukarto Primary Author PUSAT PENELITIAN KELAPA SAWIT Primary Author Endang Syamsuddin Primary Author Amir Purba Primary Author mixed material Medan 2005 2100144.jpg.jpg Tanaman penutup tanah dan gulma pada kebun kelapa sawit. Buku I Witjaksana Darmosarkoro Primary Author Endang Syamsuddin Primary Author Amir Purba Primary Author PRAWIROSUKARTO, Sudharto Additional Author mixed material Medan PPKS 2005 2100143.jpg.jpg Antisipasi & penanggulangan pengaruh kekeringan pada kelapa sawit. Iman Yani Harahap Primary Author Witjaksana Darmosarkoro Primary Author PUSAT PENELITIAN KELAPA SAWIT Additional Author Endang Syamsuddin Primary Author Edy Sigit Sutarta Primary Author Hasril Hasan Siregar Primary Author mixed material Medan PPKS 2005 Cvr_Seri_buku.JPG Kebakaran dan asap pada lahan kelapa sawit Witjaksana Darmosarkoro Primary Author PUSAT PENELITIAN KELAPA SAWIT Additional Author Endang Syamsuddin Primary Author Nuzul Hijri Darlan Primary Author Hasan Hasril Siregar Primary Author mixed material Medan PPKS 2006 12682.jpg.jpg 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. H. Adlin U. Lubis Additional Author Ir. Endang Syamsuddin Additional Author Ir. H. Suwandi Additional Author Ir. H.S Situmorang Additional Author Ir. H. Ridwan H. Lubis Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1990 COVER_VOL.10_NO.3_DESEMBER_1990.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. Endang Syamsuddin Additional Author Ir. Adlin U. Lubis Additional Author E.L. Tobing Additional Author K. Wolpers Additional Author mixed material Pematang Siantar Pusat Penelitian Marihat 1982 COVER_NO.2_VOL.2.jpg