TY - RPRT TI - Microgravity methods for characterization of groundwater-storage changes and aquifer properties in the karstic Madison aquifer in the Black Hills of South Dakota, 2009-12 AU - Karl R. Koth AU - Andrew J. Long PY - 2012 DO - 10.3133/sir20125158 UR - https://pubs.usgs.gov/publication/sir20125158 ID - sir20125158 ER -