Chicago (IL-IN-MI)

Survey type M/R-D (magnetic; radiometric; collected in digital form)
Flown by EG&G
Line spacing 9.66 (km)
Altitude 121.92 (m)
Total distance 2,052 (km)
Counties Cook - DuPage - Iroquois - Kankakee - Will - Elkhart - Fulton - Jasper - Kosciusko - Lake - LaPorte - Marshall - Newton - Porter - Pulaski - Saint Joseph - Starke - Berrien - Cass
Overlapping surveys

Data: Magnetic, radiometric (NURE) (NURE)