TY - GEN A2 - Prakken, Lawrence B. A2 - United States. Department of the Army. Joint Readiness Training Center A2 - Fort Polk (La.) AU - Geological Survey (U.S.), cartographer. CY - Reston, Va. L2 - https://purl.fdlp.gov/GPO/gpo130603 LA - English PB - [U.S. Department of the Interior, U.S. Geological Survey] PP - Reston, Va. PY - 2001 TI - Hydrogeologic framework and potentiometric surface of the Williamson Creek Aquifer "B" sand in the Fort Polk area, Vernon Parish, Louisiana, March 1997 ER -