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| 0001064728-21-000028-index.html | 2021-09-27 08:29:29 | |
| 0001064728-21-000028.txt | 2021-09-27 08:29:29 | |
 0001064728-21-000028-xbrl.zip | 13384 | 2021-09-27 08:29:29 |
| btu-20210927.htm | 36375 | 2021-09-27 08:29:29 |
| btu-20210927.xsd | 1927 | 2021-09-27 08:29:29 |
| btu-20210927_htm.xml | 11125 | 2021-09-27 08:29:29 |
| btu-20210927_lab.xml | 24137 | 2021-09-27 08:29:29 |
| btu-20210927_pre.xml | 12529 | 2021-09-27 08:29:29 |
| btu8k20210927_ex991.htm | 8717 | 2021-09-27 08:29:29 |
| FilingSummary.xml | 1648 | 2021-09-27 08:29:29 |
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| R1.htm | 38578 | 2021-09-27 08:29:29 |
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| Show.js | 1085 | 2021-09-27 08:29:29 |