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- media effectiveness[remove]7
- tape recordings[remove]7
- extension communication4
- audiovisual aids3
- development3
- development communication3
- India2
- educational media2
- educational methods2
- farmers2
- teaching methods2
- Latin America1
- agricultural development1
- communication planning1
- communication systems1
- crops1
- development issues1
- distribution1
- education effects1
- education methods1