TY  - RPRT
TI  - Circular of the Bureau of Standards no. 74 2nd edition: radio instruments and measurements
PY  - 1924
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 74e2
DO  - 10.6028/NBS.CIRC.74e2
ER  -