Verplanck, P.L., McCleskey, R.B., and Roth, D.A., 2003, Inorganic water chemistry of the Boulder Creek Watershed, Colorado, during high-flow and low-flow conditions, 2000, Chapter 4 in Murphy, S.F., Verplanck, P.L., and Barber, L.B., eds., Comprehensive water quality of the Boulder Creek Watershed, Colorado, during high-flow and low-flow conditions, 2000: U.S. Geological Survey Water-Resources Investigations Report 03-4045, p. 71-102.
