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1Published 1931Subjects: “...Agricultural extension work. http://id.loc.gov/authorities/subjects/sh85002320...”
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2Published 1926Subjects: “...Agricultural extension work. http://id.loc.gov/authorities/subjects/sh85002320...”
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3Published 1928Subjects: “...Agricultural extension work. http://id.loc.gov/authorities/subjects/sh85002320...”
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Government Document eBook