TY  - RPRT
TI  - A seismic electronic system with automatic calibration and crystal reference
AU  - John A. Rogers
AU  - Sam Maslak
AU  - John C. Lahr
PY  - 1980
DO  - 10.3133/ofr80324
UR  - https://pubs.usgs.gov/publication/ofr80324
ID  - ofr80324
ER  -