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91. Structural Features - Faults: Illinois, 1995
1995. Illinois State Geological Survey. This is a partial representation of Plate 1 from ISGS Bulletin 100 (1993). Features depicted are limited to well documented, significant faults, fa...
92. Structural Features: Illinois, 1995
1995. Illinois State Geological Survey. This feature dataset is a representation of Plate 1 from ISGS Bulletin 100 (1993) by W. John Nelson. Features depicted are limited to well document...
93. Structural Features- Line Features (Axial or Flexure) of Anticlines, Synclines and Monoclines: Illinois, 1995
1995. Illinois State Geological Survey. This is a partial representation of Plate 1 from ISGS Bulletin 100 (1993). Features depicted are limited to well documented, significant anticlines...
94. USGS Quadrangle Boundaries and Corner Points in NAD83: Illinois, 2002
1998. Illinois State Geological Survey. This feature dataset contains point, line and polygon data that describe ideal USGS quadrangle boundaries and corner points for quadrangles that in...