TY - RPRT TI - The determination of trace-level arsenic in geological materials by semi-automated hydride generation-atomic absorption spectroscopy AU - J.G. Crock AU - F.E. Lichte PY - 1981 DO - 10.3133/ofr81672 UR - https://pubs.usgs.gov/publication/ofr81672 ID - ofr81672 ER -