Watershed ecological risk assessment
Contributors: United States. Environmental Protection Agency. Office of Water
Publisher: U.S. Environmental Protection Agency, Office of Research and Development, Office of Water
Published: 1997
Place of publication: [Washington, D.C.?]
Language: eng
Subjects: Ecological risk assessment -- United States; Valley ecology -- United States
Notes: Shipping list no.: 97-0313-P

"April 1997"--P. [4] of cover

"EPA/822/F-97-002"--P. [4] of cover