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Böhlke, J. K., Harvey, J. W., and Voytek, M. A., 2004, Reach-scale isotope tracer experiment to quantify denitrification and related processes in a nitrate-rich stream in an agricultural watershed, mid-continent USA: Limnology and Oceanography, v. 49, p. 821-838. (on-line abstract or on-line report in pdf format)
Böhlke, J. K., Mroczkowski, S. J., and Coplen, T. B., 2004, New reference materials for oxygen isotopes in nitrate: Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p. 477-478.
Bratton, J.F., Böhlke, J.K., Manheim, F.T., Krantz , D.E., 2004, Ground water beneath coastal bays of the Delmarva Peninsula: Ages and Nutrients: Ground Water, vol. 42, no. 7, p. 1021-1034. (on-line abstract)
Coplen, T.B., Böhlke, J.K., and Casciotti, K., 2004, Using dual-bacterial denitrification to improve δ15N determinations of nitrates containing mass-independent 17O: Rapid Communications in Mass Spectrometry, v. 18, p. 245-250. (on-line abstract)
Landwehr, J. M., and Coplen, T. B., 2004, The oxygen and hydrogen ratios in waters from the largest river systems of the United States: Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p. 402-403.
McMahon, P. B., Böhlke, J. K., and Christenson, S. C., 2004, Geochemistry, radiocarbon ages, and paleorecharge conditions along a transect in the central High Plains aquifer, southwestern Kansas, USA: Applied Geochemistry, vol. 19, p. 1655-1686. (on-line abstract)
McMahon, P.B., Böhlke, J.K, and Lehman, T.M., 2004, Vertical gradients in water chemistry and age in the southern High Plains Aquifer, Texas, 2002: U.S. Geological Survey Scientific Investigations Report 2004-5053, 53 p. (on-line abstract and on-line report in pdf format, 2.46 MB)
Michalski, G., Böhlke, J.K., and Thiemens, M.H., 2004, Long term atmospheric deposition as the source of nitrate and other salts in the Atacama Desert, Chile: New evidence from mass-independent oxygen isotopic compositions, Geochimica et Cosmochimica Acta, vol. 68, no. 20, p. 4023-4038. (on-line abstract)
Oren, O., Yechieli, Y., Böhlke, J.K., Dody, A., 2004, Contamination of groundwater under cultivated fields in an arid environment, central Arava Valley, Israel: Journal of Hydrology, vol. 290, no. 3-4, p. 312-328 (on-line abstract)
Revesz, K., and Landwehr, J. M., 2004, Measurement of δ13C and δ18O isotopic ratios of CaCO3 by Thermoquest-Finnigan GasBench II and Delta Plus XL continuous flow isotope ratio mass spectrometer with application to Devils Hole Core DH-11 calcite: Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p. 485.
Smith, R.L., Böhlke, J.K., Garabedian, S.P., Revesz, K.M., and Yoshinari, T., 2004, Assessing denitrification in groundwater using natural gradient tracer tests with 15N: In situ measurement of a sequential multistep reaction, Water Resources Research, vol. 40, 17 p., W07101, doi: 10.1029
/2003WR002919. (on-line abstract)