TY - GEN AU - Jeffrey W Bullard C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2003-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.IR.6968 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2003 TI - User's guide to the virtual cement and concrete testing laboratory, version 1.1: ER -