Assessment of stream conditions and trends in biological and water-chemistry data from selected streams in Chester County, Pennsylvania, 1981-97 / by Andrew G. Reif ; in cooperation with Chester County Water Resources Authority.

New Cumberland, Pa. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Information Services [distributor], 2002.

x, 77 p. : ill. (some col.), maps ; 28 cm.

Shipping list no.: 2003-0132-P.

English

April 01, 2003

Includes bibliographical references (p. 48-50).