Geotechnical-Geophysical Void Mapping and Foamed-Sand Backfilling of the Rapson Coal Mine, Colorado Springs, Colorado - PowerPoint PPT Presentation

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Geotechnical-Geophysical Void Mapping and Foamed-Sand Backfilling of the Rapson Coal Mine, Colorado Springs, Colorado

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Geotechnical-Geophysical Void Mapping and Foamed-Sand Backfilling of the Rapson Coal Mine, Colorado Springs, Colorado Case Study Kanaan Hanna, Jim Pfeiffer ... – PowerPoint PPT presentation

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