Matches in Harvard for { ?s ?p Soil scientists in the United States have been studying the problem of establishing standards for soil colors for many years. The work presented in this publication is the result of efforts by many people. It is still preliminary and revisions will doubtless be suggested when the standards are used.. }
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- catalog abstract "Soil scientists in the United States have been studying the problem of establishing standards for soil colors for many years. The work presented in this publication is the result of efforts by many people. It is still preliminary and revisions will doubtless be suggested when the standards are used.".