FAO
China: azolla propagation and small- scale biogas technology report on an FAO/UNDP study tour to the peoples republic of china 1978 - Rome FAO 1978 -
FAO/SOILS/1978/41 /
China: azolla propagation and small- scale biogas technology report on an FAO/UNDP study tour to the peoples republic of china 1978 - Rome FAO 1978 -
FAO/SOILS/1978/41 /