Excerpt from The Use of Permissible Explosives in the Coal Mines of Illinois The study of mine air, mine fires, and the use of explosives is being continued, and the coking and gas-producing qualities of Illinois coals are being investigated. A detailed investigation of subsidence in Illinois is being undertaken jointly by the parties to the agreement. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.