Apparatus for drifting openings in hard rock

Leonid A Mitin, Petr Y Fadeev, Leonid F Ponomarev, Vladimir Y Fadeev, Vyacheslav F Rybert, Jury V Reutsky, Rim A Kulagin, Anatoly A Vorozheikin, Nikolai P Ermilov, L P Dimova,A G Doskaziev, Vladlen V Korobkov,Sergei A Babenko, Mikhail M Akhmatov, Nabi K Zhaksybaev Deceased, Executrix Zhaksybaeva, S By Ekaterina

mag(1981)

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