TY  - RPRT
TI  - The magnetic field of the earth, 1980 magnetic declination
AU  - E. B. Fabiano
AU  - N.W. Peddie
AU  - A.K. Zunde
PY  - 1983
DO  - 10.3133/i1457
UR  - https://pubs.usgs.gov/publication/i1457
ID  - i1457
ER  -