TY  - RPRT
TI  - Letter Circular 917: artificial abrasives and abrasive products (replaces Letter Circular 812)
PY  - 1948
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 917
DO  - 10.6028/NBS.LCIRC.917
ER  -