TY  - RPRT
TI  - Composite magnetic anomaly map of the United States: Part A: Conterminous United States
AU  - Isidore Zietz
PY  - 1982
DO  - 10.3133/gp954a
UR  - https://pubs.usgs.gov/publication/gp954A
ID  - gp954A
ER  -