<p>?An important official publication covering all aspects of subterranean warfare with much practical detail for the guidance of mining companies of the Great War.</p><p>Contents:</p><p>Subterranean Warfare.</p><p>Shafts and Galleries.</p><p>Countermines.</p><p>Ventilation and Lighting of Galleries.</p><p>Charges and Effects of Mines.</p><p>Preparing Mines for Firing.</p><p>Firing Powder Charges without Electricity.</p><p>Firing Charges by Electricity.</p><p>Boring and blasting.</p><p>Explosives.</p><p>Demolitions with Gunpowder.</p><p>Demolitions with Guncotton.</p><p>Demolition of Railways.</p><p>Demolitions of Telegraph Lines.</p>