Parent Directory| Name | Size | Last Modified |
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| 0001064728-22-000056-index.html | 2022-07-28 08:02:23 | |
| 0001064728-22-000056.txt | 2022-07-28 08:02:23 | |
 0001064728-22-000056-xbrl.zip | 34316 | 2022-07-28 08:02:23 |
| btu-20220728.htm | 36363 | 2022-07-28 08:02:23 |
| btu-20220728.xsd | 1927 | 2022-07-28 08:02:23 |
| btu-20220728_htm.xml | 11251 | 2022-07-28 08:02:23 |
| btu-20220728_lab.xml | 24137 | 2022-07-28 08:02:23 |
| btu-20220728_pre.xml | 12529 | 2022-07-28 08:02:23 |
| btu8k20220728ex991.htm | 460851 | 2022-07-28 08:02:23 |
| FilingSummary.xml | 1658 | 2022-07-28 08:02:23 |
| Financial_Report.xlsx | 5698 | 2022-07-28 08:02:23 |
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| MetaLinks.json | 16728 | 2022-07-28 08:02:23 |
| R1.htm | 38555 | 2022-07-28 08:02:23 |
| report.css | 2767 | 2022-07-28 08:02:23 |
| Show.js | 1085 | 2022-07-28 08:02:23 |