Summary of Survey on Groundwater Vulnerability Mapping Practices in the United States Open-file report; contains unpublished data that has not yet been peer-reviewed. Groundwater Data and Resources WOFR1993-01 Summary of Survey on Groundwater Vulnerability Mapping Practices in the United States Zaporozec, A.; 1993 Report: 84 p. Download Related Collections Open-File Report View Open-File Report