Laserfiche WebLink
<br /> <br />Evaluation of Trends in pH in the <br />Yampa River, Northwestern Colorado, <br />1950-2000 <br /> <br />By Daniel 1. Chafin <br /> <br />U,S, GEOLOGICAL SURVEY <br /> <br />Water-Resources Investigations Report 02-4038 <br /> <br />Denver, Colorado <br />2002 <br />