The following material is from Natural Resource Year in Review--1996, published by the National Park Service, U.S. Department of the Interior, in May 1997 (publication D-1182)

 

National park system units in study basins of the National Water Quality Assessment Program.

National park system units in study basins of the National Water Quality Assessment Program. Water Resources Division.

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This material is from Natural Resource Year in Review--1996, published by the National Park Service, U.S. Department of the Interior, in May 1997 (publication D-1182) http://www2./YearInReview/yir/yr_rvw96 /chapter4/nawqa1.htm
Last Update: 8/20/2002