Excerpt from Standard Reference Materials: Catalog and Price List of Standard Materials Issued by the National Bureau of Standards To meet this need, the nbs Miscellaneous Publication 260 Series has been reserved for papers in the general area of standard reference materials. This serles begins with a descriptive pride list of standard materials available. Succeeding publications present the results of studies and investigations undertaken within the Institute for Materials Research with emphasis on the preparation and characterization of standard reference materials. This subject oriented series provides a means for rapid dissemination of this detailed infor mation and we h0pe will stimulate the use Iof standard reference materials in science and industry. 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.