TY  - BOOK
AU  - Nasution Usman
AU  - Azwar Rasidi
AU  - Supriyanto
TI  - Performance of PB 260 and PB 330 clones in rubber plantations of North Sumatra
PB  - In: Prosidings of the Lokakarya Nasional Pemuliaan Tanaman Karet, Medan 1992; p267-278
KW  - North Sumatra
KW  - Rubber plantation
ER  -