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- Australia (Oceania)1
- Yemen (Western Asia)1
- agricultural development1
- agricultural research1
- agriculture research1
- barriers1
- behavior1
- communication barriers1
- communication behavior1
- communication education1
- communicator effectiveness1
- community services1
- cultural barriers1
- developing nations1
- development programs1
- experiments1
- extension education2
- extension programs1
- farmer attitudes1
- farming systems3