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| 0001064728-21-000020.txt | 2021-07-29 08:01:49 | |
 0001064728-21-000020-xbrl.zip | 31228 | 2021-07-29 08:01:49 |
| btu-20210729.htm | 36121 | 2021-07-29 08:01:49 |
| btu-20210729.xsd | 1927 | 2021-07-29 08:01:49 |
| btu-20210729_htm.xml | 11125 | 2021-07-29 08:01:49 |
| btu-20210729_lab.xml | 24137 | 2021-07-29 08:01:49 |
| btu-20210729_pre.xml | 12529 | 2021-07-29 08:01:49 |
| btu8k20210729ex991.htm | 353517 | 2021-07-29 08:01:49 |
| FilingSummary.xml | 1647 | 2021-07-29 08:01:49 |
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