TY - RPRT TI - Direct observation of the depth of active groundwater circulation in an alpine watershed AU - Andrew H. Manning AU - Lyndsay B. Ball AU - Richard B. Wanty AU - Kenneth H. Williams PY - 2021 DO - 10.1029/2020wr028548 UR - https://pubs.usgs.gov/publication/70219122 ID - 70219122 ER -