Excerpt from Lake Michigan Open Water and Lake Bed Survey, 1969: Report to the Governor and 76th General Assembly Continued monitoring of water quality and surveys of bottom deposits and ecology are necessary in order to evaluate the effectiveness of the control measures implemented by the State of Illinois and neighbor lake states to control, to improve, and to eliminate discharge of wastes to Lake Michigan by municipalities and industries. 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.