Montgomery, W. J. (1936). Theory and practice of mine ventilation. The Jeffrey manufacturing co..
Lua i Stíl Chicago (17ú heag.)Montgomery, William John. Theory and Practice of Mine Ventilation. Columbus, O.: The Jeffrey manufacturing co., 1936.
Lua MLA (8ú heag.)Montgomery, William John. Theory and Practice of Mine Ventilation. The Jeffrey manufacturing co., 1936.
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