@misc{Roy_Andrew_(1834-1914)_The_1876, author={Roy, Andrew (1834-1914)}, address={Cleveland, Ohio,}, howpublished={online}, year={1876}, publisher={Robinson, Savage & Co.}, language={angielski}, title={The coal mines : containing a description of the various systems of working and ventilating mines, together with a sketch of the principal coal regions of the globe, including statistics of the coal production}, type={tekst}, }