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Soils
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Soil formation
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Soil surveys
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Forest soils
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Frozen ground
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Reclamation of land
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Soil mapping
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1241Tetsudōshō Doshitsu Chōsa Iinkai hōkoku鐵道省土質調查委員會報告.Published 1931[Tokyo] : Tetsudō Daijin Kanbō Kenkyūjo, Shōwa 6 [1931]-v. ; 25 cm.