U.S. DEPARTMENT OF THE INTERIOR, Gale A. Norton, Secretary

U.S. GEOLOGICAL SURVEY, Charles G. Groat, Director

Influence of Natural Factors on the Quality of Midwestern Streams and Rivers

Denver, Colorado 2001

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Copies of this report can be purchased from:

U.S. Geological Survey

Branch of Information Services

Box 25286

Federal Center

Denver, CO 80225-0286

For additional information write to:

Regional Hydrologist

U.S. Geological Survey

Box 25046, Mail Stop 406

Denver Federal Center

Denver, CO 80225-0046

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