309 resultados para Soil conservation projects

em University of Michigan


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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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"August 1964"--P. [1].

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Mode of access: Internet.

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Includes bibliographies.

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Mode of access: Internet.