Инструкция по выбору рамных податливых крепей горных выработок

Инструкция по выбору рамных податливых крепей горных выработок

128 Pages · 2013 · 9.36 MB · Russian
by Ёшкин кот
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“ Happiness doesn't result from what we get, but from what we give. ” ― Ben Carson
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