Excerpt from Mineral Production in Illinois in 1966 The value of minerals produced in Illinois in 1966 amounted to 644 million dollars. This was the highest annual value ever recorded for mineral production in the state. Illinois minerals showing increases in value over 1965 totals were coal, com mon sand and gravel, silica sand, and fluorspar. Clay products also showed an increase over the 19 65 total. Other minerals produced in Illinois generally recorded slight declines in value for 1966 as com pared to 1965. The quantity and value of the var ious minerals produced in 1966 are summarized in the tables and maps of this report. 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.