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37. Miner at Work Underground in a Coal Mine

38. Miners Roof Bolting

39. Miners Roof Bolting

40. Miners Operating a Loading Machine

41. Coal Miner Works in Tight Quarters

42. Miners Shoring up Ceiling of a Coal Mine

43. Shuttle Car Carrying Timber in the Mine

44. Miner on an Electric Cart

45. Miner Operating a Cutting Machine

46. Miner at Work in a Low Ceiling Coal Mine

47. Transporting Lumber for Shoring in a Coal Mine

48. Transporting Lumber for Shoring in a Coal Mine