The INSTAAR Laboratory for AMS Radiocarbon Preparation and Research (NSRL) pursues a wide variety of geochronological and geochemical applications and related method development in radiocarbon research in collaboration with AMS 14C measurement facilities.   Investigators interested in pursuing collaborative research with NSRL should contact Scott Lehman, Laboratory Director (Scott.Lehman@Colorado.edu, ph (303)492-8980).   NSRL maintains a complete archive of material remaining following processing of samples submitted to the laboratory and an extensive data base recording experimental conditions during all stages of sample processing. We are pleased to answer any questions regarding availability of remaining material or sample processing. Please direct such inquiries to Jocelyn Turnbull, Staff Chemist (Jocelyn.Turnbull@Colorado.edu, ph (303)735-6611).