na INLIS000000000001057 0010-0124000743 Slash-and-burn rice systems in the Hills of Northern Lao PDR : description, challenges, and oppurtunities W. Roder RODER, W. Los Banos, Philippines International Rice Research Institute 2001 vi, 20 p. : ills. ; 27 cm. 633.18 ROD s RICE SHIFTING CULTIVATION HILLS NORTHERN LAO PDR. 095/2002