TY  - RPRT
TI  - Letter Circular 841: glass and glass products (supersedes Letter Circular 350)
PY  - 1946
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 841r1946
DO  - 10.6028/NBS.LCIRC.841r1946
ER  -