TY - RPRT TI - Estimating nitrate concentrations in groundwater at selected wells and springs in the surficial aquifer system and Upper Floridan aquifer, Dougherty Plain and Marianna Lowlands, Georgia, Florida, and Alabama, 2002-50 AU - Christy A. Crandall AU - Brian G. Katz AU - Marian P. Berndt PY - 2013 DO - 10.3133/sir20135150 UR - https://pubs.usgs.gov/publication/sir20135150 ID - sir20135150 ER -