Radon

Noble gas element with symbol Rn and atomic number 86 <http://periodic.lanl.gov/86.shtml>
This category is also used for Rn.
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Radon in soils of parts of Cameron, Hidalgo, and Willacy Counties, Texas

Analysis of soil samples in the Texas borderland area

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National Geochemical Database: Rock

Geochemical analysis of rock samples collected and analyzed by the USGS. This dataset includes and supersedes rock data formerly released as "Geochemistry of igneous rocks in the US extracted from the PLUTO database"

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