TY  - BOOK
AU  - Hazen, Grace
AU  - Kenyon, Frieda
TI  - Primary Radio-Frequency Standardization by use of the Cathode-Ray Oscillograph
U1  - 621.38417 
PY  - 1924///
CY  - Washington
PB  - Government Printing Office
KW  - Cathode-Ray
ER  -