TY  - RPRT
TI  - Letter Circular 399: weights and measures publications of general interest (replaces Letter Circular 243)
PY  - 1933
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 399
DO  - 10.6028/NBS.LCIRC.399
ER  -