Stream composition of the conterminous United States

This atlas is comprise of three maps of the conterminous United States which show separately the prevalent dissolved-solids concentrations, prevalent chemical type, and average sediment concentration of rivers. The river-composition data shown on plates 1-3 provide a starting point for evaluating our surface-water resources on a nationwide scale, indicate regions where acceptable supplies might be found and delineate some of the principal trouble spots throughout the country.