Excerpt from Procedures Used at the National Bureau of Standards to Determine Selected Trace Elements in Biological and Botanical Materials This publication contains a detailed description of the procedures used at nbs to determine twenty-five trace elements in biological and botanical matrices. They were used to determine the trace element content of spinach, orchard leaves, pine needles, tomato leaves, bovine liver, blood serum, etc. The dissemination of these procedures, and their careful use, should permit other analysts to perform measurements with an accuracy comparable to those obtained at nbs. 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.

February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index