TY - GEN AU - Stevens, Mary Elizabeth C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1970-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.MONO.91e1970 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1970 TI - Automatic indexing ::a state-of-the-art report ER -