TY  - RPRT
TI  - Letter Circular 666: weights and measures, a selected list of publications of the National Bureau of Standards (supersedes Letter Circular 593)
PY  - 1941
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 666
DO  - 10.6028/NBS.LCIRC.666
ER  -