na INLIS000000000055647 20220906084933 0010-0922000109 ta 220906 g 0 ind 633/634 633/634 BAL r Balai Penelitian Perkebunan Medan Rencana Penelitian 1974/1975 Medan : Balai Penelitian Perkebunan Medan, 1975 72 p. : ill. ; 28 cm. Plantation 546/D/1981