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- politics[remove]2
- Africa1
- Botswana (Africa, Southern)1
- Kenya (Africa, Eastern)1
- Nigeria (Africa, Western)1
- USA (United States of America; North America)1
- USDA (United States Department of Agriculture)1
- Zimbabwe (Africa, Eastern)1
- advisory services1
- agricultural development1
- agricultural produce1
- book review1
- communication methods1
- communication systems1
- cooperation1
- cooperative programs1
- crops1
- extension education1
- extension services1
- government1