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1. Chemical Modeling of Acid Waters [USGS_WATEQ4F]
WATEQ4F is a chemical speciation code for natural waters. It uses field measurements of temperature, pH, Eh, dissolved oxygen and alkalinity, and the chemical analysis of a water sample as input and ...

2. National Geochemical Survey database [USGS-NGS-database]
The USGS, in collaboration with other federal and state government agencies, industry, and academia, is conducting the National Geochemical Survey (NGS) to produce a body of geochemical data for the ...

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