TY  - RPRT
TI  - Origins of a national seismic system in the United States
AU  - John R. Filson
AU  - Walter J. Arabasz
PY  - 2016
DO  - 10.1785/0220160039
UR  - https://pubs.usgs.gov/publication/70194182
ID  - 70194182
ER  -