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- farmers[remove]3
- pamphlets[remove]3
- extension communication2
- information sources2
- readership2
- Puerto Rico, USA (Latin America; Caribbean)1
- agriculture1
- books1
- bulletins1
- circulation1
- crops1
- education effects1
- extension1
- extension information1
- extension methods1
- extension services1
- farm journals1
- farming1
- farming methods1
- farms1