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Development of Blind Shaft Boring System.
Proc 3rd Symp on Ungrd Min NCA/BCR Coal Conf & Expo IV 1977 Oct; :42-85
Proc. 3rd Symp. on Ungrd. Min. NCA/BCR Coal Conf. & Expo IV October 18-20, 1977, PP. 42-85
Page last reviewed: March 11, 2019
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