TY - GEN AU - Paul Stutzman AU - Nathanael Heckert C2 - Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD DA - 2019-03-20 DO - https://doi.org/10.6028/NIST.SP.260-195 LA - en PB - Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD PY - 2019 TI - Certification of Standard Reference Material® SRM2687a Portland Cement Clinker ER -