Sequential nitrification-denitrification in a plug flow activated sludge system /

Mode of access: Internet.

Automatic sludge blanket control in an operating gravity thickener /

Mode of access: Internet.

Investigations of biodegradability and toxicity of organic compounds /

Mode of access: Internet.

Energy conservation through source reduction /

"November 1978."

Compendium of ERT toxicity testing procedures : interim final.

"7-day standard reference toxicity test using larval pimephales promelas; 24-hour rangefinding test using daphnia magna or daphnia pulex; 96-hour acute toxicity test using larval pimephales promelas ... ."

Evaluation of the standard sampling technique for suspended solids /

Mode of access: Internet.

Chemical emergency preparedness and prevention technical assistance bulletin : New York, New York : El Paso County, Colorado : Alexandria, Virginia : State of Maine.

"March 1990."