TY  - RPRT
TI  - Earth's magnetic field complex: U.S. National activities during the Decade of Geopotential Field Research
AU  - Michael E. Purucker
AU  - T. Sabaka
AU  - W. Kuang
AU  - S. Maus
AU  - Jeffrey J. Love
PY  - 2009
UR  - https://pubs.usgs.gov/publication/70200675
ID  - 70200675
ER  -