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- farming systems[remove]3
- technology transfer[remove]3
- Australia (Oceania)1
- Yemen (Western Asia)1
- agricultural development1
- agricultural research1
- barriers1
- communication barriers1
- communication behavior1
- communication education1
- communicator effectiveness1
- community services1
- cultural barriers1
- developing nations1
- development programs1
- experiments1
- extension education1
- extension programs1
- farming systems research1
- information flow1