TY  - RPRT
TI  - The 1995 revision of the joint US/UK geomagnetic field models. II: Main field
AU  - J.M. Quinn
AU  - R.J. Coleman
AU  - S. Macmillan
AU  - D.R. Barraclough
PY  - 1997
UR  - https://pubs.usgs.gov/publication/70019203
ID  - 70019203
ER  -