Classification and mapping og agricultural land for National Water-Quality assessment /

Autor Gilliom, Robert J., Thelin, Gail P.
Vydáno 1997

Design of the National water-quality assessment program : occurrence and distribution of water-quality conditions /

Autor Gilliom, Robert J., Alley, William M., 1952-, Gurtz, Martin E.
Vydáno 1995

The quality of our nation's waters : nutrients and pesticides /

Autor Fuhrer, Gregory J., Gilliom, Robert J., Hamilton, Pixie A., 1957-, Morace, Jennifer L., Nowell, Lisa H., Rinella, Joseph F., Stoner, Jeffrey D., Wentz, Dennis A.
Vydáno 1999