TY  - RPRT
TI  - Intercomparison study of Rockwell hardness test blocks 
AU  - Shives, T Robert
AU  - Smith, John H
PY  - 1991
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST IR 4531
DO  - 10.6028/NIST.IR.4531
ER  -