http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Evaluation of agricultural best-management practices in the Conestoga River Headwaters, Pennsylvania
effects of nutrient management on quality of surface runoff at a small carbonate-rock site near Ephrata, Pennsylvania, 1984-90
1 online resource (viii, 59 pages) : illustrations, maps.
by David W. Hall, Patricia L. Lietman, and Edward H. Koerkle ; prepared in cooperation with the Pennsylvania Department of Environmental Protection.
Includes bibliographical references (pages 57-59).
Water-resources investigations report ; 95-4143
Water-quality study of the Conestoga River Headwaters, Pennsylvania