TY  - RPRT
TI  - Safety rules for the installation and maintenance of electric supply stations: comprising part I and the grounding rules of the fifth edition, national electrical safety code 
PY  - 1940
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS HB 31
DO  - 10.6028/NBS.HB.31
ER  -