TY  - RPRT
TI  - Total intensity aeromagnetic map of Porter County, Indiana
AU  - William J. Dempsey
AU  - John R. Henderson
AU  - R. T. Duffner
PY  - 1950
DO  - 10.3133/gp30
UR  - https://pubs.usgs.gov/publication/gp30
ID  - gp30
ER  -