TY - GEN AU - Geller, Sidney B C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1972-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.731 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1972 TI - Calibration of secondary standard magnetic tape cassettes (computer amplitude reference) phase I: ER -