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1. Our American land : the story of its abuse and its conservation (id:CAT87209318)

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2. Thomas Jefferson, soil conservationist (id:CAT88900165)

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3. Conservation farming practices and flood control (id:CAT87207242)

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4. Soil reconnaissance of the Panama Canal Zone and contiguous territory (id:CAT88900166)

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5. Soil erosion a national menace (id:CAT87212611)

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6. Grouping of soils on the basis of mechanical analysis (id:CAT87217164)