TY - GEN AU - L P Purtell C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1979-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.989 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1979 TI - A low-velocity airflow calibration and research facility: ER -