20 មករា 2017 Both in Ethiopia and in the countries of East Africa, the continuing proliferation and spread of invasive alien species (IAS) is now recognized as a serious problem, which needs to be addressed. While this situation has improved dramatically over the past 10 years, further progress has been...
ធនធានសំខាន់01 មករា 1976 Perspectives for developing countries for controlling aquatic weeds and using them to best advantage, especially those methods that show promise for less-developed countries. ASIN:B001988YC8