TY  - RPRT
TI  - Aeromagnetic map of Iowa: Color coded intensities
AU  - Isidore Zietz
AU  - F. P. Gilbert
AU  - J. R. Kirby
PY  - 1976
DO  - 10.3133/gp911
UR  - https://pubs.usgs.gov/publication/gp911
ID  - gp911
ER  -