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1Published 1930Subjects: “...United States. Department of Agriculture. Office of the Secretary. http://id.loc.gov/authorities...”
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2Published 1914Subjects: “...Agricultural laborers. http://id.loc.gov/authorities/subjects/sh85002338...”
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3Published 1914Subjects: “...Agricultural productivity. http://id.loc.gov/authorities/subjects/sh85002401...”
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4Published 1914Subjects: “...Agricultural productivity. http://id.loc.gov/authorities/subjects/sh85002401...”
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5Published 1913Subjects: “...Agricultural productivity. http://id.loc.gov/authorities/subjects/sh85002401...”
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Government Document eBook