Carmody, R.W, Plummer, L.N., Busenberg, E., and Coplen, T.B., 1998, Methods for collection of dissolved sulfate and sulfide and analysis of their sulfur isotopic composition: U. S. Geological Survey Open-File Report 97-234, 91 p.
Coplen, T. B., 1998, A manual for a laboratory information management system (LIMS) for light stable isotopes Version 7.0: U. S. Geological Survey Open-File Report 98-284, 124 p.
Coplen, T. B., and Peiser, H. S., 1998, History of the recommended atomic-weight values from 1882 to 1997: A comparison of differences from current values to the estimated uncertainties of earlier values: Pure and Applied Chemistry, v. 70, no. 1, p. 237-257. (on-line abstract or to obtain pdf file)
Coplen, T.B., and Krouse, H.R., 1998, Sulphur isotope data consistency improved: Nature, v. 392, p. 32.
Focazio, M.J., Plummer, L.N., Böhlke, J.K., Busenburg, E., Bachman, L.J., and Powars, D.S., 1998, Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed, and water-quality data from a survey of springs: U.S. Geological Survey Water Resources Investigations Report 97-4225, 75 p. (on-line abstract or on-line pdf file)
Hopple, J.A., Hannon, J.E., and Coplen, T.B., 1998, Comparison of two stable hydrogen isotope-ratio measurement techniques on Antarctic surface-water and ice samples: Chemical Geology, v. 152, p. 321-323. (on-line abstract)
Revesz, K., Böhlke, J.K., Yoshinari, T., 1998, δ18O and δ15N determination in nitrate: International Atomic Energy Agency, Isotope Techniques in the Study of Environmental Change, Vienna, p. 851-854.
Winograd, I.J., Riggs, A.C., and Coplen, T.B., 1998, The relative contributions of summer and cool-season precipitation to groundwater recharge, Spring Mountains, Nevada, USA: Hydrogeology Journal, v. 6, p. 77-93. (on-line abstract)