TY  - RPRT
TI  - Black and white composite magnetic anomaly map of the United States: Part A, conterminous United States
AU  - Isidore Zietz
PY  - 1983
DO  - 10.3133/gp960a
UR  - https://pubs.usgs.gov/publication/gp960A
ID  - gp960A
ER  -