TY  - RPRT
TI  - Letter Circular 913: simplified practice recommendations (superseding Letter Circular 895)
PY  - 1948
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 913r1948
DO  - 10.6028/NBS.LCIRC.913r1948
ER  -