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- media effectiveness[remove]3
- teaching methods[remove]3
- India2
- farmers2
- knowledge level2
- accuracy1
- bibliographies1
- communication research1
- demonstrations1
- development communication1
- education methods1
- extension agents1
- grains1
- group teaching1
- information sources1
- radio1
- radio schools1
- research communication1
- research needs1
- rural broadcasting1