State of the watershed [electronic resource] : water quality of Boulder Creek, Colorado / U.S. Dept. of the Interior, U.S. Geological Survey ; by Sheila Murphy ; prepared in cooperation with the City of Boulder, Colorado.
Imprint
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : For sale by U.S. Geological Survey, Information Services, 2006.