Proceedings International Congress of Soil Science. Vol 1 No 2-6(1927) - International Congress of Soil Science (Washington D.C. International Congress of Soil Science, 1927)
International Congress of Soil Science: Proceedings International Congress of Soil Science. Vol 1 No 2-6(1927). Washington D.C.. International Congress of Soil Science, 1927.--(631.406INT)
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