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4Published 1970Subjects: “...Agriculture United States Charts, diagrams, etc....”
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5Published 2002Subjects: “...Farmers' bulletin (United States. Department of Agriculture) Indexes....”
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6Published 1983Subjects: “...Agriculture Research United States....”
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7Published 1999Subjects: “...Agriculture Research United States....”
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8
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9Published 1957Subjects: “...Agriculture Research United States....”
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10
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11
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12by Martin, W. W.Subjects: “...Solar energy in agriculture United States....”
Published 1976
Microform Book -
13by Enlow, Robert E.Subjects: “...Agriculture United States Energy conservation....”
Published 1982
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14
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16Published 1977Subjects: “...Solar energy in agriculture United States....”
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17Published 1965Subjects: “...Agriculture United States....”
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18
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19
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20
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