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Soil conservation
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38
Great Plains Conservation Program
7
Conservation tillage
5
Erosion
3
Legislative amendments
3
Rangelands
3
Soil Conservation and Domestic Allotment Act
3
Water conservation
3
Contour farming
2
Droughts
2
Government contractors
2
Grasses
2
Grazing
2
Public contracts
2
Revegetation
2
Tree planting
2
United States. Department of Agriculture. Soil Conservation Service (1935-1942, 1945-)
2
Wind erosion
2
Act To Amend the Act of August 7, 1956 (70 Stat. 1115), as Amended, Providing for a Great Plains Conservation Program
1
Blue grama grass
1
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