TY - RPRT TI - Percentage of Probability of Nonpoint-Source Nitrate Contamination of Recently Recharged Ground Water in the High Plains Aquifer AU - Sharon L. Qi AU - Jason J. Gurdak PY - 2006 DO - 10.3133/ds192 UR - https://pubs.usgs.gov/publication/ds192 ID - ds192 ER -