TY - RPRT TI - Radiogenic 4He as a conservative tracer in buried‐valley aquifers AU - Stephen J. Van der Hoven AU - R. Erik Wright AU - David A. Carstens AU - Keith C. Hackley PY - 2005 DO - 10.1029/2004wr003857 UR - https://pubs.usgs.gov/publication/70027762 ID - 70027762 ER -