Excerpt from Reclamation of Used Petroleum Lubricating Oils <p></p>In the western part of the United States there is an abundance of oil shale, but the processes of extracting and refining the oil are still in the experimental state, and shale oil must be regarded as a product of the future rather than as a means already avail able for supplementing the petroleum from the wells. <p></p>About the Publisher <p></p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p></p>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.