TY  - RPRT
TI  - Letter Circular 183: directions for use of the piezo oscillator and auxiliary generator for calibration of a radio frequency meter
PY  - 1925
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 183
DO  - 10.6028/NBS.LCIRC.183
ER  -