1. Sampling Tubing Effects on Groundwater Samples
2. M. J. Barcelona, J. A. Helfrich, and E. E. Garske, 1986 Field verification of sampling methods and materials, selection for ground-water contamination studies. Proc. of Symposium on Field Methods for Ground Water Contamination Studies and their Standardization. ASTM, FL.
3. Well construction and purging effects on ground-water samples
4. M. J. Barcelona, and J. A. Helfrich, 1988 Laboratory and field studies of well-casing material effects. Proceedings of the Ground Water Geochemistry Conference, National Water Well Assoc., Dublin, OH 43017. pp.363 -375 .
5. R. P. Biegen, J. W. Hess, and J. E. Denne, 1988 Field comparison of ground-water sampling devices. Presented at the NWWA Second Annual Outdoor Action Conference, Las Vegas.