Kerr, G.L. Practical coal mining : a manual for managers, under-managers, colliery engineers, and others : wuth numerous problems arising from colliery work and over 520 figures and diagrams / by George L. Kerr; G.L. Kerr .— : Charles Griffin & Company, 1900 .— 841 с. — Lang: eng .— URL: https://rucont.ru/efd/128531 (дата обращения: 29.05.2024)