Barber, Larry B, Murphy, Sheila F, Verplanck, Philip L, Sandstrom, Mark W, Taylor, Howard E, and Furlong, Edward T, 2006, Chemical Loading into Surface Water along a Hydrological, Biogeochemical, and Land Use Gradient: A Holistic Watershed Approach: Environmental Science & Technology, v. 40, iss. 2, p. 475-486.