TY - GEN AU - William C Daywitt C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1987-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.87-3073 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1987 TI - Horn design equations for the NBS horn-type noise standards: ER -