TY  - RPRT
TI  - Circular of the Bureau of Standards no. 6 5th edition: fees for electric, magnetic, and photometric testing
PY  - 1913
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 6e5
DO  - 10.6028/NBS.CIRC.6e5
ER  -