TY  - RPRT
TI  - The 1995 revision of the joint US/UK geomagnetic field models - I. Secular variation
AU  - S. Macmillan
AU  - D.R. Barraclough
AU  - J.M. Quinn
AU  - R.J. Coleman
PY  - 1997
UR  - https://pubs.usgs.gov/publication/70019514
ID  - 70019514
ER  -