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- cooperation[remove]6
- national programs[remove]6
- cooperative programs4
- agricultural research3
- international programs3
- research3
- USDA2
- communication systems2
- communication units2
- extension communication2
- land grant universities2
- research organizations2
- rural development2
- state programs2
- agriculture research1
- bias1
- conflict1
- development1
- diffusion1
- extension1