| Page |
Illustrations |
| 44 |
Section of mine cut. |
| 85 |
Section resulting from continental drift. |
| 112 |
Strip mining equipment. |
| 113 |
Panorama of Site No. 11. |
| 114 |
Moonscape of Site No. 11. |
| 115 |
Sites No.'s 3 and 4. |
| 116 |
George Langford, Jr. collecting. |
| 117 |
George Langford, Sr. and George Langford, Jr. cracking nodules. |
| 118 |
George Langford, Sr. collecting. |
| Page |
Maps |
| 58 |
Localities No.'s 3, 4 7, & 8. |
| 78 |
Collecting Sites, prepared by George Langford, Sr., 1940. |
| 80 |
Will County collecting sites 1937. |
| 83 |
Continental drift. |