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<br />r <br /> <br />.~ <br /> <br />- <br /> <br />Stream Channel Erosion Protection <br /> <br />~ <br /> <br />Ir!/;PI; <br /> <br />at Roadway Crossings <br /> <br />J.C. Blodgett <br />U.S. Geological Survey <br />Sacramento, CA <br /> <br />August 1981 <br />