TY  - RPRT
TI  - Letter Circular 185: specifications for portable frequency meter for frequencies from 1500 to 15000 kilocycles, Bureau of Standards type K
PY  - 1928
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 185r1928
DO  - 10.6028/NBS.LCIRC.185r1928
ER  -