na INLIS000000000001551 0010-1220000392 Soil conservation on a slopeland orchord at Sufen, Tahu, Mioli China Council of Agriculture Ref. of China 1989 12 p. ill ; 26 cm 631.45 631.45 POTATO UBI JALAR POTATO KENTANG SWEET POTATO CHINA. 2507 2507 2507