Jonathan D. Karr

Karr, J. D., Showers, W. J., & Jennings, G. D. (2003). Low-level nitrate export from confined dairy farming detected in North Carolina streams using delta N-15. AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 95(1), 103–110. https://doi.org/10.1016/S0167-8809(02)00103-2

Karr, J. D., & Showers, W. J. (2002). Stable oxygen and hydrogen isotopic tracers in Amazon shelf waters during Amasseds. OCEANOLOGICA ACTA, 25(2), 71–78. https://doi.org/10.1016/S0399-1784(02)01183-0