files.dep.state.pa.us - /Mining/District Mining/DistrictMinePortalFiles/California/Underground Mining/PA History/


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4/30/2012 9:00 AM 83759 coal_production.pdf
4/30/2012 9:03 AM 111311 Drift_Mine.pdf
4/30/2012 9:05 AM 146547 early_mining1.pdf
4/30/2012 9:06 AM 162462 early_mining2.pdf
4/30/2012 9:08 AM 93662 longwall_mining.pdf
4/30/2012 9:09 AM 133671 Mine_entry.pdf
4/30/2012 9:12 AM 111274 Outcrop.pdf
4/30/2012 9:14 AM 153951 PA_coal_fields_map.pdf
4/30/2012 9:19 AM 89036 room_and_pillar_mining.pdf
4/30/2012 9:20 AM 129909 underground_view.pdf