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- history[remove]9
- transportation[remove]9
- advertising3
- promotion3
- USA (United States of America; North America)2
- adoption2
- agricultural development2
- change2
- development2
- extension services2
- farm journals2
- gender2
- literature2
- marketing2
- politics2
- recreation2
- rural development2
- social change2
- telephone communication2
- women2