A 31-page manual on biological studies in Iowa rivers, streams, and lakes.
Indicator species are used as an early warning of pollution or degradation in an ecosystem.
Running time 1:51 minutes. Available by subscription.
Agricultural economic outlook and key indicators.
The Northern Prairie Wildlife Research Center is one of the U.S. Geological Survey's Biological Resource Science Centers. It has one of the most comprehensive listings of biological resources...
The document is an annual report of the activities of the MIT Nepali Water Project. The purpose of the project is to improve drinking water quality in Nepal through reduction in contamination of...
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