TY  - RPRT
TI  - International Geomagnetic Reference Field 1980: charts and grid values, IAGA Bulletin No. 47
AU  - Eugene B. Fabiano
AU  - N.W. Peddie
AU  - D.R. Barraclough
AU  - A.K. Zunde
PY  - 1982
DO  - 10.3133/ofr82377
UR  - https://pubs.usgs.gov/publication/ofr82377
ID  - ofr82377
ER  -