Biogas fertilizer system :
Biogas fertilizer system : technical report on a training seminar in China.
- Nairobi : United Nations Environment Programme, 1981.
- 86 p.
- UNEP reports and proceedings series ; 2 .
eng.
9280710272
Biodegration.
Fertilizers.
China.
WA 780
eng.
9280710272
Biodegration.
Fertilizers.
China.
WA 780