TY  - RPRT
TI  - Magnetic models for the United States for 1985
AU  - Norman W. Peddie
AU  - Audronis K. Zunde
PY  - 1990
DO  - 10.3133/cir1039
UR  - https://pubs.usgs.gov/publication/cir1039
ID  - cir1039
ER  -