5 1 10 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 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 Adlin U. Lubis Additional Author A. Sipayung Additional Author Fidber Chan Additional Author Suwandi Additional Author A.D. Koedadiri Additional Author Harjono Simangun Additional Author H.S. Situmorang Additional Author mixed material 02161427 Pematang Siantar Pusat Penelitian Marihat 1987 COVER_VOL.7_NO.2_AGUSTUS_1987.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