Database structure

Table	Description
datadxny	Data dictionary, explaining tables and fields
main	Sample location, characteristics, and general methods of collection and analysis
chemistry	All chemical analyses recorded for the sample, with analytical method, measured values, and qualifiers to indicate where a measured value was outside the reliable detection limits of the method
bestvalue	Best analytic value for each element obtained by selecting the most reliable analytic methods from among those that were performed on the sample