Parent Directory| Name | Size | Last Modified |
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| 0001064728-22-000036-index.html | 2022-04-28 07:19:21 | |
| 0001064728-22-000036.txt | 2022-04-28 07:19:21 | |
 0001064728-22-000036-xbrl.zip | 32316 | 2022-04-28 07:19:21 |
| btu-20220428.htm | 36980 | 2022-04-28 07:19:21 |
| btu-20220428.xsd | 1927 | 2022-04-28 07:19:21 |
| btu-20220428_htm.xml | 11251 | 2022-04-28 07:19:21 |
| btu-20220428_lab.xml | 24137 | 2022-04-28 07:19:21 |
| btu-20220428_pre.xml | 12529 | 2022-04-28 07:19:21 |
| btu8k20220428ex991.htm | 357823 | 2022-04-28 07:19:21 |
| FilingSummary.xml | 1658 | 2022-04-28 07:19:21 |
| Financial_Report.xlsx | 5674 | 2022-04-28 07:19:21 |
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| MetaLinks.json | 16728 | 2022-04-28 07:19:21 |
| R1.htm | 38710 | 2022-04-28 07:19:21 |
| report.css | 2767 | 2022-04-28 07:19:21 |
| Show.js | 1085 | 2022-04-28 07:19:21 |