| Publication Type: | Journal Article |
| Year of Publication: | 1917 |
| Authors: | T. Wayland Vaughan |
| Journal: | United States Geological Survey Professional Paper |
| Volume: | 98 |
| Pagination: | 355–386 |
| URL: | http://books.google.com/books?id=ztgaAAAAYAAJ |
| Publication Type: | Journal Article |
| Year of Publication: | 1917 |
| Authors: | T. Wayland Vaughan |
| Journal: | United States Geological Survey Professional Paper |
| Volume: | 98 |
| Pagination: | 355–386 |
| URL: | http://books.google.com/books?id=ztgaAAAAYAAJ |