TY  - RPRT
TI  - A discussion of sources and description of the Earth's magnetic field and its secular variations
AU  - Leroy Romney Alldredge
AU  - Charles O. Stearns
PY  - 1974
DO  - 10.5636/jgg.26.393
UR  - https://pubs.usgs.gov/publication/70246994
ID  - 70246994
ER  -