Chemical analyses of surface waters in Colorado, October 1959 to September 1962

Data presented herein are records of water quality for the period October 1959 to September 1962 for the sampling sites shown below and on the enclosed map. The data are preliminary and subject to revision. Final records are published in the annual series of Geological Survey Water-Supply Papers entitled "Quality of Surface Waters of the United States, " which can be obtained from the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20242.