TY  - RPRT
TI  - United States National seismograph network
AU  - Robert P. Masse
AU  - J.R. Filson
AU  - A. Murphy
PY  - 1989
DO  - 10.1016/0040-1951(89)90063-2
UR  - https://pubs.usgs.gov/publication/70015357
ID  - 70015357
ER  -