TY  - RPRT
TI  - Letter Circular 587C: refractories (supersedes Letter Circular 131C)
PY  - 1940
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 587C
DO  - 10.6028/NBS.LCIRC.587C
ER  -