TY - GEN AU - R L McKenzie C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1990-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.260e1990 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1990 TI - NIST standard reference materials catalog 1990-91: ER -