Title: Filtered magnetic anomaly maps of Illinois /
Authors: Hildenbrand, T. G.; Kucks, R. P.; Geological Survey (U.S.)
Publisher: The Survey ; For sale by Map Distribution,
Year: 1992
Subjects: Magnetic anomalies Illinois Maps.; Illinois Maps.
Contents: map A. Residual total magnetic field reduced to the north magnetic pole -- map B. First vertical derivative of the magnetic field -- map C. Pseudogravity field -- map D. Magnitude of the horizontal gradient of the pseudogravity field.