1. James P. Gibb, 1980 . Monitoring-well sampling and preservation techniques. Illinois State Water Survey. Paper for Sixth Annual Research Symposium of the Solid and Hazardous Waste Research Division, U.S. EPA, March.
2. U.S. Environmental Protection Agency . 1977 . Procedures manual for groundwater monitoring at solid waste disposal facilities. EPA/530/SW-611.
3. Wisconsin Department of Natural Resources . 1978 . Sampling of groundwater monitoring wells for industrial facilities. Internal Memorandum, Industrial Wastewater Section.