1. Management of lakes in Indonesia;Soerjani,1978
2. Present waste management in cities in Indonesia;Soerjani;Conserv. Recycl.,1984
3. Agricultural waste as an energy source at present and its prospects;Soepomo;Directorate General for Food Production, Jakarta,1978
4. Possibilities in the development of firewood material and agricultural products;HaRtojo,1978
5. Aquatic weed for mushroom culture;Kasno,1985