Excerpt from Geophysical Abstracts 149: April-June, 1952 (Numbers 13548-13802) The system of transliteration used for Russian names and titles is that of the Board on Geographic Names. A table showing this system was included in Geophysical Abstracts 148. Geophysical Abstracts 1 - 86 and 112 - 127 were issued as Information Circulars by the Bureau of Mines, and 87 -111 were issued as Bulletins of the Geological Survey. Geo-physical Abstracts 128 and following numbers have been published as Bulletins of the Geological Survey. 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.

The United States Geological Survey (USGS) is a scientific organization created in 1879, and is part of the U.S. government. Their scientists explore our environment and ecosystems, to determine the natural dangers we are facing. The agency has over 10,000 employees that collect, monitor, and analyze data so that they have a better understanding of our problems. The USGS is dedicated to provide reliable, investigated information to enhance and protect our quality of life. This is one of their bulletins.