TY  - RPRT
TI  - Safety rules for the installation and maintenance of electric supply and communication lines: comprising part 2, the definition of the grounding rules of the sixth edition of the national electrical safety code 
PY  - 1961
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS HB 81
DO  - 10.6028/NBS.HB.81
ER  -