Parent Directory| Name | Size | Last Modified |
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| 0000757011-18-000109-index.html | 2018-11-13 16:10:49 | |
| 0000757011-18-000109.txt | 2018-11-13 16:10:49 | |
| form8-k_11132018.htm | 42367 | 2018-11-13 16:10:49 |
| usg_ex101x11132018.htm | 28001 | 2018-11-13 16:10:49 |
| usg_ex41x11132018.htm | 27802 | 2018-11-13 16:10:49 |