TY  - RPRT
TI  - Letter Circular 186: specifications for portable piezo oscillator, Bureau of Standards type N
PY  - 1926
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 186r1926
DO  - 10.6028/NBS.LCIRC.186r1926
ER  -