publication venue for
- Once again the Bier/ISGS physiographic map of Illinois; enlargements, reducations, ZR coordinates, and consolidated exercises.. 37:24-28. 1995
- Human geography and physical features of Illinois as revealed on the Bier/ISGS physiographic map; focus on central Illinois.. 36:16-38. 1994
- Interpreting the physical geography of Illinois as shown on the BIER/ISGS physiographic map; northern and southern examples.. 35:24-34. 1993