National Geochemical Database: Soil
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资源简介：
Geochemical analysis of soil samples from the National Geochemical
Database. Primarily inorganic elemental concentrations, most
samples are from the continental US and Alaska.
Samples were collected and analyzed over many decades,
beginning in the 1960s, though some samples may have been collected
earlier.
创建时间：
2016-10-29
