GCC-4 X-rays (0-50 cm)
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Top of GCC-4 (0-30 cm)
GCC-4sec1
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GCC-4sec2 (30-50 cm)
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http://geopubs.wr.usgs.gov/open-file/of03-111/Analyses/GCC4/xray/xraycc4.html maintained by Carolyn Donlin last modified 19 February 2003 (lzt)
