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An Analysis of Material and Method
出版U.S. Department of Agriculture, 1935
URLhttp://books.google.com.hk/books?id=uG9aewZCT7EC&hl=&source=gbs_api
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註釋The purpose of this publication is to summarize the recent knowledge regarding the formation and significance of the great soil groups in the United States for the general reader. The treatment is in no sense complete or exhaustive. Attention is directed toward a discussion of those principles in broad implication. Should the reader require more specificity, the detailed reports of surveys and researches must be consulted.