1. The clean water act: 20 years later;Adler,1993
2. Ecological–economic modeling on a watershed basis: lessons from the Cache River of Southern Illinois;Beaulieu,2000
3. Raising farm subsidies, U.S. widens international rift;Becker;New York Times,2002
4. Evaluating non-point pollution policy using a tightly coupled spatial decision support system;Bennett;Environmental Management,2001
5. Integrating simulation models and geographic information for environmental problem solving;Bennett,2000