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21. Gullies : how to control and reclaim them (id:ORC00000364)

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22. Terracing farm lands (id:ORC00000527)

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23. The control of blowing soils (id:ORC00000154)

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24. Experiment station work, XLIX : conservation of soil resources, fig culture in the South, potato breeding, mushroom growing, disk-harrowing alfalfa, preserving wild mushrooms, the Montreal muskmelon, cooking beans and other vegetables, storage of hubbard squash, a model kitchen (id:ORC00000121)

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25. The conservation of natural resources (id:ORC00000116)

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26. Renovation of worn-out soils (id:ORC00000079)