1. Angino, E. E., and G. K. Billings, 1967, Atomic absorption spectrometry in geology: Elsevier Publishing Co., New York, Methods in Geochem. and Geophys. Series, p. 107–112.
2. Black, C. A., 1965, Methods of soil analysis: Madison, Wisconsin, Am. Joc. Agronomy, Inc., Part I., p. 562–566: Part II., p. 1372.
3. Colston, V., Jr., 1973, Characterization and treatment of urban land runoff: Environmental Protection Agency, Office of Research and Development, Project 11030 HJP Program Element, BB034, p. 106.
4. Copeland, B. J., and J. E. Hobbie, 1972. Phosphorus and eutrophication in the Pamlico River Estuary, North Carolina, 1966–1969 — A summary: Univ. North Carolina, Water Res. Res. Instit., Rept. No. 65, 86 p.
5. --, and H. L. Davis 1972, Estuarine ecosystems and high temperatures: Univ. North Carolina, Water Res. Res. Instit. Rept. No. 68, 90 p.