TY - GEN AU - Robert A Fletcher AU - David S Bright C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1983-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.82-2561 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1983 TI - NBS portable ambient particulate sampler: ER -