TY - RPRT TI - A new syringe pump apparatus for the retrieval and temporal analysis of helium in groundwaters and geothermal fluids AU - P.H. Barry AU - David R. Hilton AU - M.D. Tryon AU - K. M. Brown AU - J.T. Kulongoski PY - 2009 DO - 10.1029/2009gc002422 UR - https://pubs.usgs.gov/publication/70035560 ID - 70035560 ER -