Beard’s Ventilation of Mines 12mo, 2 50 Boyd’s Resources of Southwest Virginia 8vo, 3 00 Map of Southwest Virginia Pocket-book form, 2 00 Douglas’s Untechnical Addresses on Technical Subjects 12mo, 1 00 * Drinker’s Tunneling, Explosive Compounds, and Rock Drills 4to, hf. mor., 25 00 Eissler’s Modern High Explosives 8vo, 4 00 Fowler’s Sewage Works Analyses 12mo, 2 00 Goodyear’s Coal-mines of the Western Coast of the United States 12mo, 2 50 Ihlseng’s Manual of Mining 8vo, 5 00 * Iles’s Lead-smelting. (Postage 9c. additional.) 12mo, 2 50 Kunhardt’s Practice of Ore Dressing in Europe 8vo, 1 50 O’Driscoll’s Notes on the treatment of Gold Ores 8vo, 2 00 Robine and Lenglen’s Cyanide Industry. (Le Clerc.) 8vo, * Walke’s Lectures on Explosives 8vo, 4 00 Wilson’s Cyanide Processes 12mo, 1 50 Chlorination Process 12mo, 1 50 Hydraulic and Placer Mining 12mo, 2 00 Treatise on Practical and Theoretical Mine Ventilation 12mo, 1 25 SANITARY SCIENCE.