TY  - RPRT
TI  - Correction sheet for first edition (March 23, 1918) of Bureau of Standards circular no.74, radio instruments and measurements 
PY  - 1918
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 74errata
DO  - 10.6028/NBS.CIRC.74errata
ER  -