978 resultados para Soil Conservation


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Mode of access: Internet.

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Includes bibliographical references (p. 82).

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Cover title.

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Contribution from Soil Conservation Service.

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"The greater part of the material used was selected from the files of the Work Projects Administration Erosion history project, 701-2-240, Columbia, S.C."--Foot-note, p. 1.

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Cover title.

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Contribution from Soil Conservation Service.

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"U.S. Dept. of Agriculture in cooperation with the Agricultural Experiment Station, University of Puerto Rico."