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- agricultural development[remove]14
- rural development[remove]14
- development8
- development issues6
- Latin America3
- Asia2
- communication methods2
- community development2
- cooperation2
- development communication2
- diffusion2
- education effects2
- extension2
- extension agents2
- extension programs2
- extension services2
- innovations2
- research needs2
- research organizations2
- roles2