File:Penn carbondale 4-77.jpg
Figure 4-77. The “blue band” at a site where the Herrin Coal is reduced to thin streaks of coal, box cut at the Francisco Mine, Gibson County, Indiana. Photograph 2010 by Scott D. Elrick. © University of Illinois Board of Trustees.
Click on a date/time to view the file as it appeared at that time.
|current||21:28, 4 January 2021||2,401 × 2,041 (4.22 MB)||IlLex|
- You cannot overwrite this file.