Historical Aspects of Soil Survey and Soil Classification
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[1] R. Simonson. Historical Aspects of Soil Survey and Soil Classification. Part VI. 1951–1960 , 1986 .
[2] C. Kellogg. Soil genesis, classification, and cartography: 1924–1974 , 1974 .
[3] G. Coffey. The Present Status and Future Development of Soil Classification 1 , 1916 .
[4] K. Glinka. Die Typen der Bodenbildung, ihre Klassifikation und geographische Verbreitung , 1914 .
[5] G. Coffey. Progress Report of the Committee on Soil Classification and Mapping , 1914 .
[6] George N. Coffey,et al. The Development of Soil Survey Work in the United States with a Brief Reference to Foreign Countries , 1911 .