Excerpt from Mineral Resources of the United States, 1920, Vol. 2: NonmetalsThe following statistics of imports were Obtained from the Bureau of Foreign and Domestic Commerce, Department Of Commerce, and converted for some tables from lon to short tons. The first table shows that imports more than treb ed, increasing from tons in 1919 to tons in 1920. This, however, is a small quantity compared with that usually imported before the W'orld War: Magnesite, not purified, imported into the United States in 1919 and 1920.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.