TY  - RPRT
TI  - Letter Circular 842: list of commercial standards (supersedes Letter Circular 836)
PY  - 1947
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 842r1947
DO  - 10.6028/NBS.LCIRC.842r1947
ER  -