Design of the national water-quality assessment program : occurrence and distribution of water-quality conditions /
Gilliom, Robert J.
Alley, William M.
Gurtz, Martin E.
Sacramento, Calif. : U.S. Geological Survey ; [Washington] U.S. G.P.O.,
1995.
Includes bibliographical references (p. 33).
National Water Quality Assessment Program (U.S.)
Water quality