TY  - RPRT
TI  - Circular of the Bureau of Standards no. 56 2nd edition: standards for electric service
PY  - 1923
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 56e2
DO  - 10.6028/NBS.CIRC.56e2
ER  -