Excerpt from Subject Heading List for Naval Research LibrariesLibraries and research agencies have indicated such wide use of earlier editions of the list in establishing a uniform type of indexing that a third edition has been made. The Office of Research and Inventions will be pleased to receive comments and further suggestions on this work. Future revisions will be made as further demand arises.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.