TY - RPRT TI - Hydrogeologic characteristics of Hourglass and New Years Cave Lakes at Jewel Cave National Monument, South Dakota, from water-level and water-chemistry data, 2015–21 AU - Colton J. Medler PY - 2022 DO - 10.3133/sir20225108 UR - https://pubs.usgs.gov/publication/sir20225108 ID - sir20225108 ER -