TY  - RPRT
TI  - Safety rules for the installation and maintenance of electric supply stations: comprising part 3 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 33
DO  - 10.6028/NBS.HB.33
ER  -