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

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 4/30/2012 10:00 AM        83759 coal_production.pdf
 4/30/2012 10:03 AM       111311 Drift_Mine.pdf
 4/30/2012 10:05 AM       146547 early_mining1.pdf
 4/30/2012 10:06 AM       162462 early_mining2.pdf
 4/30/2012 10:08 AM        93662 longwall_mining.pdf
 4/30/2012 10:09 AM       133671 Mine_entry.pdf
 4/30/2012 10:12 AM       111274 Outcrop.pdf
 4/30/2012 10:14 AM       153951 PA_coal_fields_map.pdf
 4/30/2012 10:19 AM        89036 room_and_pillar_mining.pdf
 4/30/2012 10:20 AM       129909 underground_view.pdf