TY  - RPRT
TI  - Circular of the Bureau of Standards no. 121: construction and operation of a two-circuit radio receiving equipment with crystal detector
PY  - 1922
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 121
DO  - 10.6028/NBS.CIRC.121
ER  -