TY - GEN AU - Henig, Seymour C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1960-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.54 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1960 TI - Determination of a general index of effort in sorting mail by conventional methods: ER -