TY  - RPRT
TI  - Taking the Earth's pulse
AU  - Robert L. Woodward
AU  - Harly M. Benz
AU  - William M. Brown
PY  - 1997
DO  - 10.3133/fs10397_1997
UR  - https://pubs.usgs.gov/publication/fs10397_1997
ID  - fs10397_1997
ER  -