TY  - RPRT
TI  - Microstructure, composition, and hardness of Rockwell C Hardness blocks 
AU  - Siewert, T A
AU  - Tomer, A
PY  - 1991
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 3960
DO  - 10.6028/NIST.IR.3960
ER  -