Kerr, G.L. Practical coal mining : a manual for managers, under-managers, colliery engineers, and others : with numerous problems arising from colliery work and over 520 figures and diagrams / by George L. Kerr; G.L. Kerr .— : Charles Griffin & Company Limited, 1900 .— 840 с. — Lang: eng .— URL: https://rucont.ru/efd/122345 (дата обращения: 11.07.2024)