Excerpt from Illinois Mineral Industry in 1939: With Special Discussion of Distribution of Coal in 1937 Flux Railroad ballast Riprap Rubble Agricultural Other uses Natural gasoline (gallons) Natural gas (therms) Lime Fuller 3 earth. Fluorspar (short tons) Quartz (silica) Clay, raw, including that burned at mine or pit. Tripoli. Sandstone Pyrites. Other minerals. 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.