The Online Books Page

Books by Martha L Erwin:

Books in the extended shelves:

• Erwin, Martha L: Monitoring our rivers and streams ([U.S. Dept. of the Interior, U.S. Geological Survey], 2002), also by Pixie A Hamilton and Geological Survey (U.S.) (page images at HathiTrust)
• Erwin, Martha L.: Predicting ground water vulnerability to nitrate in the Puget Sound Basin (U.S. Dept. of the Interior, U.S. Geological Survey, National Water-Quality Assessment Program, 1997), also by A. J. Tesoriero and National Water-Quality Assessment Program (U.S.) (page images at HathiTrust)
• Erwin, Martha L: USGS ground water flow model ([U.S. Dept. of the Interior, U.S. Geological Survey], 1999), also by T. Scott Bruce, E. Randolph McFarland, Geological Survey (U.S.), and Virginia. Department of Environmental Quality (page images at HathiTrust)

Find more by Martha L Erwin at your library, or elsewhere.