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Modeled minus observed lithium concentration classifications for model validation data used to estimate geogenic lithium in drinking-water supply wells throughout the conterminous United States. Li classifications: Class 1 (≤4 μg/L); Class 2 (>4 to ≤10 μg/L); Class 3 (>10 to ≤30 μg/L); and Class 4 (>30 μg/L).
