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Subjects
Longwall mining, Gate roads (Mining), Ground control (Mining), Pillaring (Mining), Data processing, Early works to 1800, Islam, Islamic ethics, Religious life, Rock deformationPlaces
PennsylvaniaID Numbers
- OLID: OL834189A
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August 22, 2008 | Edited by RenameBot | fix author name |
April 1, 2008 | Created by an anonymous user | initial import |