TY - RPRT TI - Preliminary report on 40Ar/39Ar incremental heating experiements on feldspar sample from the Felsite Unit, Geysers Geothermal Field, California AU - G. Brent Dalrymple PY - 1992 DO - 10.3133/ofr92407 UR - https://pubs.usgs.gov/publication/ofr92407 ID - ofr92407 ER -