TY - GEN AU - M Leighton Greenough AU - Robert M McCabe C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1975-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.75-746 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1975 TI - Preparation of reference data sets for character recognition research: ER -