The Online Books Page

Books by Mark A. Hardy:

Books in the extended shelves:

• Hardy, Mark A.: Chemical and biological quality of streams at the Indiana Dunes National Lakeshore, Indiana, 1978-80 (U.S. Geological Survey ;, 1984), also by Geological Survey (U.S.) and United States National Park Service (page images at HathiTrust)
• Hardy, Mark A.: Effects of coal fly-ash disposal on water quality in and around the Indiana Dunes National Lakeshore, Indiana (U.S. Geological Survey, 1981), also by Geological Survey (U.S.) and United States National Park Service (page images at HathiTrust)
• Hardy, Mark A.: Land use, organochlorine compound concentrations, and trends in benthic-invertebrate communities in selected stream basins in Chester County, Pennsylvania (U.S. Dept. of the Interior, U.S. Geological Survey ;, 1995), also by Craig R. Moore, Kim L. Wetzel, Chester County Water Resources Authority, and Geological Survey (U.S.) (page images at HathiTrust)
• Hardy, Mark A.: Water resources of Wildcat Creek and Deer Creek basins, Howard and parts of adjacent counties, Indiana, 1979-82 (U.S. Geological Survey ;, 1985), also by Barry S. Smith, E. James Crompton, Geological Survey (U.S.), and Indiana. Department of Natural Resources (page images at HathiTrust)
• Hardy, Mark A.: Well installation and documentation, and ground-water sampling protocols for the pilot National Water-Quality Assessment Program (Dept. of the Interior, Geological Survey ;, 1989), also by William M. Alley, P. Patrick Leahy, and Geological Survey (U.S.) (page images at HathiTrust)

Find more by Mark A. Hardy at your library, or elsewhere.