Online Books by
Ralph D. Ludwig
Books from the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Ludwig, Ralph D.: Agricultural drainage wells : impact on ground water / (Ada, OK : Robert S. Kerr Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, [1990]), also by Donald A. Sternitzke, Ron L. Drake, Dynamac Corporation, and Robert S. Kerr Environmental Research Laboratory (page images at HathiTrust)- Ludwig, Ralph D.: Workshop on monitoring oxidation-reduction processes for ground-water restoration : Workshop summary, Dallas, Texas, April 25-27, 2000 / (Cincinnati, OH : U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, 2002), also by Richard T. Wilkin, Robert G. Ford, United States. Environmental Protection Agency. Office of Research and Development, and National Risk Management Research Laboratory (U.S.). Subsurface Protection and Remediation Division (page images at HathiTrust)
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