950 resultados para Soil conservation projects


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Contribution from Soil Conservation Service.

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Contribution from Soil Conservation Service.

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Contribution from Soil Conservation Service.

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Originally issued August 1940.

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Contribution from Soil Conservation Service.

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"October 1940."

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Prepared in cooperation with Soil Conservation Service, U.S. Geological Survey, N.C. Dept. of Natural and Economic Resources, and N.C. State University Agricultural Experiment Station.

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Contribution from Soil Conservation Service.

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Chiefly illustrations.

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"Issued June 1942."

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Cover title.

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Includes bibliographical references (p. 159-166).

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Issued also as House document no. 289, 84th Cong., 2d sess.

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Bibliography: p. 17.