TY  - RPRT
TI  - Letter Circular 816: simplified practice recommendations (supersedes Letter Circular 794)
PY  - 1946
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 816r1946
DO  - 10.6028/NBS.LCIRC.816r1946
ER  -