Methods for comparing water-quality conditions among National Water-Quality Assessment Study Units, 1992-1995 /

Mode of access: Internet.

Water-quality assessment of the Lower Susquehanna River Basin, Pennsylvania and Maryland : sources, characteristics, anaylsis, and limitations of nutrient and suspended-seditment data, 1975-90 /

"National Water-Quality Assessment Program"

Lake water quality assessment program, 1993 : northeastern Illinois lakes /

"January 1995."

Lake water quality assessment program : northeastern Illinois lakes /

"The Northeastern Illinois Planning Commission's Natural Resources Dept. conducted the lake assessment data collection effort for the six county northeastern Illinois region." -- P. iii.

Water quality in the Potomac River basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96 /

Mode of access: Internet.

National Acid Precipitation Assessment Program [microform] : hearing before the Subcommittee on Natural Resources, Agriculture Research, and Environment of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundredth Congress, second session, April 27, 1988.

"No. 125."

Collection and analysis of ground-water samples in the Sierra Vista Basin, Arizona, 1996 /

Mode of access: Internet.

Hydrogeologic facies characterization of an alluvial fan near Fresno, California, using geophysical techniques /

Mode of access: Internet.

Organochlorine pesticides and PCBs in aquatic ecosystems of the Central Columbia Plateau.

Mode of access: Internet.

Pesticides in public supply wells of the Central Columbia Plateau.

Mode of access: Internet.

Water-quality assessment of the Indiana Dunes National Lakeshore, 1973-74 /

Mode of access: Internet.