1. Water-Quality Trends in the Nation's Rivers
2. Becker CD Neitzel DA eds. Water quality in North American river systems. Columbus: Battelle Press 1992.
3. assessing effects of pesticides on amphibians and reptiles: status and needs;Hall RJ;Herpetol J,1992
4. Chadwick DH. The biodiversity challenge. Special report. Washington DC:Defenders of Wildlife 1990.
5. Bury RB. Habitat relationships and ecological importance of amphibians and reptiles in streamside management. In: Riparian wildlife and forestry interactions (Raedeke KJ ed). Seattle:University of Washington Press 1988; 61-76.