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  1. Geology of Nebraska - Wikipedia

  2. STATEMAP: Surficial Geologic Maps of Nebraska - University of Nebraska

  3. Map of Nebraska - Geology.com

  4. STATEMAP | Geology - University of Nebraska–Lincoln

  5. NebraskaMap

  6. National Geologic Map Database - USGS

  7. USGS: Professional Paper 17 — Preliminary Report on the Geology

  8. Geology Related GIS Data - University of Nebraska–Lincoln

  9. Nebraska Geology - University of Nebraska–Lincoln

  10. Maps & More | Nebraska Maps & More - University of Nebraska