TY  - RPRT
TI  - Circular of the Bureau of Standards no. 31 2nd edition: copper wire tables
PY  - 1914
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 31e2
DO  - 10.6028/NBS.CIRC.31e2
ER  -